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  • The Mineral name field supports the wildcard '*'.
    Entering 'ca*' (without the quotes of course) will return all minerals starting with 'ca',
    e.g. Calcite, Caledonite..
    Entering '*ca*' will return all minerals names containing 'ca', e.g. Calcite, Caledonite, Atacamite, Marcasite..

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    containing the word 'twin', e.g. 'Repeated penetration twin on {110}'.

Abhurite

Thin tabular {0001}

Adamite

{101}, {110}, {111}

Adamite

{101}, modified

Adamite

{100}, {110}, {011}, modified

Aegirine

{661}, {110}, modified

Aeschynite

{110}, {021}, {010}, {001}

Aeschynite

{011}, {120}, {010}, modified

Aeschynite

Tabular {010}

Albite

{010}, {001}, {110}, {110}, {111}, {111}

Albite

{101}, {001}, {010}, modified

Albite

{010}, {001}, {101}, modified

Albite

Pericline law twin with rhombic section

Albite

Combined albite law and Karlsbad law twin

Albite

{110}, {010}, {111}, modified

Allactite

Tabular {100}

Allanite

Tabular {100},

Allanite

Tabular {100},

Alstonite

Pseudohexagonal cyclic twin

Altaite

{100}

Altaite

{100}, {111}

Alunite

{102}, {001}

Amphibole

{110}, {010}, {011}, {201}

Amphibole

Short prismatic [001], highly modified

Analcime

{100} modified by {211}

Analcime

{211}

Analcime

{100}

Analcime

{211}, {322}

Analcime

{211}, modified by {100}, {111}

Anatase

{101}

Anatase

{101}, {001}

Anatase

{101}, {205}

Anatase

{101}, {6.4.19}, {001}

Anatase

{101}, modified

Anatase

{101}, {001}, modified

Anatase

{305}, {107}, modified

Anatase

{101}, {001}, modified

Anatase

{101}, {107}, {1.1.14}, modified

Anatase

{307}, {101}, modified

Anatase

Penetration twin on {112}

Ancylite

{110}, {011}

Andalusite

{110}, {001}, modified

Andalusite

{110}, {001}, modified

Andalusite

{110}, {001}, modified

Andalusite

{110}, {011}, modified

Andorite

Short prismatic [001]

Andorite

Tabular {010}

Anglesite

{101}, {210}

Anglesite

{101}, {210}, {001}

Anglesite

{101}, {210}, {211}, {001}

Anglesite

{011}, {111}, modified

Anglesite

{001}, {010}, {210}, modified

Anglesite

{111}, {101}

Anglesite

{410}, {011}, {001}, modified

Anglesite

{101}, {210}, {011}, modified

Anglesite

{102}, {011}, modified

Anglesite

{102}, {210}, modified

Anglesite

{210}, {001}, modified

Anglesite

{111}, {011}, modified

Anhydrite

{100}, {010}, {011}

Anhydrite

{100}, {010}, {001}, {045}

Anhydrite

{100}, {010}, {001}, modified

Anhydrite

{101}, {053}, modified

Anhydrite

Several prisms {h0l}, {011}

Anhydrite

Contact twin on {021}

Anorthite

{201}, {001}, {010}, modified

Anorthite

{010}, {201}, {001}, modified

Antimony

{102}

Antimony

{104}

Antimony

{014}, {001}

Antimony

{014}, {001}, modified

Antimony

Fourling twin on {014}

Antimony

{102}, {001}

Antimony

Contact twin on {014}

Antimony

Contact twin on {014}

Antimony

Contact twin on {014}

Apatite

{100}, {001}

Apatite

{100}, {101}

Apatite

{100}, {001}, {101}

Apatite

{100}, {001}, modified

Apatite

{100}, {001}, modified

Apatite

{100}, {001}, modified

Apatite

Highly modified crystal

Apatite

{100}, {101}, modified

Apatite

Penetration twin on {111}

Apatite

{100}, {111}, {001}, modified

Aphthitalite

Tabular {001}

Aphthitalite

Tabular {001}

Apophyllite

{110}, {101}

Apophyllite

{110}, {001}, {101}

Apophyllite

{101}, {110}, {310}

Apophyllite

{110}, {001}, modified

Apophyllite

{101}, {1.1.10}, modified

Apophyllite

Tabular {001}, modified

Aragonite

{110}, {001}

Aragonite

{110}, {011}, {001}

Aragonite

Contact twin on {110}

Aragonite

{110}, {021}

Aragonite

{110}, {010}, {011}, modified

Aragonite

{110}, {010}, prisms {0kl}

Aragonite

Repeated penetration twin on {110}

Aragonite

Repeated contact twin on {110}

Aragonite

Repeated contact twin on {110}

Aramayoite

Tabular {010}

Ardennite

Prisms {hk0}, {010}, {323}, modified

Arfvedsonite

Short prismatic [001]

Argentite

{111}, {100}

Argentite

Parallel growth of octahedra

Argentite

{100}, modified

Argyrodite

Penetration twin on [111]

Arsenic

{102}

Arsenic

{014}

Arsenic

Penetration twin on {104}

Arsenopyrite

{110}, {021}

Arsenopyrite

{110}, {012}

Arsenopyrite

Penetration twin on {201}

Arsenopyrite

Repeated contact- and penetration twin on {201}

Arsenopyrite

Prismatic {011}, {110}, modified

Arsenopyrite

Repeated penetration twin on {110}

Atacamite

{110}, {011}, {010}, modified

Atacamite

{110}, {011}

Atacamite

{110}, {011}, modified

Atacamite

Short prismatic {011}

Atacamite

Penetration twin on {544}

Atacamite

Tabular {010}

Atacamite

Prismatic [001]

Augelite

{001}, {110}, modified

Augelite

{001}, {110}, {201}

Augite

{100}, {110}, {011}, modified

Augite

Contact twin on {100}

Avogadrite

Tabular {100}

Axinite

{110}, {010}, {011}, modified

Axinite

{110}, {010}, {011}, modified

Axinite

{011}, {111}, {010}, modified

Azurite

{110}, {001}, {111}

Azurite

{110}, {111}, modified

Azurite

{001}, {102}, {011}, modified

Azurite

Prismatic [010], highly modified

Azurite

Prismatic [010]

Babingtonite

Isometric

Baddeleyite

Contact twin on {100}

Barite

{101}, {210}

Barite

{001}, {011}, {101}, modified

Barite

{011}, {101}, modified

Barite

{001}, {210}, modified

Barite

Tabular {001}

Barite

{001}, {210}, modified

Barytocalcite

{100}, {111}, {001}

Barytocalcite

Short prismatic [101]

Becquerelite

{011}, {111}

Becquerelite

Elongated [010]

Benitoite

{102}, {001}, modified

Benitoite

{012}, modified

Bertrandite

Tabular {001}

Bertrandite

Tabular {001}

Bertrandite

Contact twin on {021}

Beryl

{100}, {101}, {112}

Beryl

{100}, {001}

Beryl

{100}, {001}, modified

Beryl

{100}, {001}, modified

Beryl

{100}, {001}, highly modified

Beryl

Tabular {001}

Beryllonite

Tabular {010}, higly modified

Berzeliite

{211}, modified

Beudantite

{102}, modified

Beudantite

{102}, modified

Beudantite

{021}, modified

Bieberite

{111}, {101}, modified

Biotite

{001}, {010}, {331}

Bischofite

{100}, {110}, {111}, modified

Bischofite

{110}, {201}, {111}

Bismuthinite

{110}, {010}, {310}, modified

Bismuthinite

{110}, {010}, modified

Bismuthinite

{110}, {010}, {311}, modified

Bismutotantalite

{130}, {111}, modified

Bixbyite

{100}, {211}

Bixbyite

{100}, modified by {211}

Blödite

{110}, {001}, modified

Blödite

{111}, {110}, {011}, highly modified

Boleite

With epitaxial overgrowths of pseudoboleite

Boracite

{100}, modified

Boracite

{110}, modified

Boracite

{111}, modified

Borax

{100}, {010}, {001}, modified

Borax

Contact twin on {100}

Borax

{100}, {110}, {010}, {001}, modified

Bornite

{100}

Bornite

{111}, {100}

Bornite

Penetration twin on [111]

Bornite

{110}

Bournonite

Tabular {001}

Bournonite

Repeated contact twin on {110}

Bournonite

Contact twin on {110}

Bournonite

Tabular {001}

Braunite

{112}, {211}

Braunite

{112}, modified

Braunite

{112}, highly modified

Braunite

{100}, {213}, modified

Braunite

Contact twin on {102}

Brazilianite

{011}, {111}

Breithauptite

Tabular {001}

Bromellite

{100}, {101}, {001}

Brookite

Tabular {010}

Brookite

Prismatic {120}, modified

Brookite

{140}, {111}, modified

Brookite

{111}, {120}

Brookite

Tabular {010}

Brucite

{101}, {001}, {201}

Brucite

{001}, {110}

Calciohilairite

{110}, {120}, {102}

Calcite

{101}

Calcite

{021}

Calcite

{211}

Calcite

{021}, {101}

Calcite

{100}, {101}

Calcite

{401}, {211}

Calcite

{100}, {331}, {001}

Calcite

{401}, modified

Calcite

Contact twin on {001}

Calcite

{100}, {101}, {045}

Calcite

Contact twin on {001}

Calcite

Contact twin on {001}

Calcite

Parallel growth of flat rombohedra

Calcite

{021}, modified

Calcite

{401}, modified

Calcite

{100}, {101}, modified

Calcite

{2131}, modified

Calcite

{021}, {100}, modified

Calcite

{101}, modified

Calcite

{101}, modified

Calcite

{532}, modified

Calcite

{214}, {110}, modified

Calcite

Contact twin on {001}

Calcite

{401}, {725}, modified

Calcite

{581}, {101}, modified

Calcite

Contact twin on {101}

Calcite

Contact twin on {101}

Calcite

Contact twin on {021}

Calcite

Contact twin on {012}

Calcite

Contact twin on {001}

Calcite

{211}, {012}

Calcite

{413}, {100}, {012}

Calcite

{413}, {100}, {012}, contact twin on {001}

Calcite

{012}, {100}

Calcite

Contact twin on {001}, triangular habit due to underdevelopment of prism faces

Calcite

{413}, {100}, {012}, contact twin on {001}

Calcite

{413}, {081}, modified, contact twin on {001}

Calcite

{012}, {283}, contact twin on {001}

Calcite

{101}, {021}

Calcite

Contact twin on {012}

Calcite

{2131}, {0112}

Calcite

Contact twin on {1011}

Calcite

Contact twin on {0001}, contact plane {1010}

Calcite

Contact twin on {0001}, contact plane {1010}

Caledonite

{010}, {100}, {101}

Caledonite

Prismatic [001]

Calomel

Prismatic {110}

Calomel

{118}, {111}, modified

Calomel

Contact twin on {112}

Calomel

{110}, {013}, modified

Carnallite

Equant

Carnallite

Tabular {001}

Cassiterite

{110}, {111}, modified

Cassiterite

{110}, {111}, modified

Cassiterite

Contact twin on {101}

Cassiterite

Repeated contact twin on {101}

Cassiterite

Repeated contact twin on {101}

Cassiterite

Repeated contact twin on {101}

Cassiterite

{111}, {011}

Cassiterite

{676}, modified

Catapleiite

{100}, {001}

Catapleiite

Tabular {001}

Catapleiite

Tabular {001}

Catapleiite

Tabular {001}

Catapleiite

{001}, {103}

Cavansite

{111}, {101}

Celestine

Prismatic {011}, {210}, modified

Cerussite

Tabular {010}

Cerussite

{010}, {021}, {012}, {110}, {111}

Cerussite

Repeated penetration twin on {110}

Cerussite

Tabular {100}

Cerussite

Contact twin on {110}

Cerussite

Prismatic [100], highly modified

Cerussite

Pseudohexagonal {111}, {021}

Chabazite

{101}

Chalcocite

Tabular {001}, modified

Chalcocite

Penetration twin on {032}

Chalcocite

Multiple twin on {110}

Chalcocyanite

{010}, {110}, {011}, modified

Chalcophyllite

Tabular {001}

Chalcopyrite

Lamellar contact twin on {112} by {112}

Chalcopyrite

{112} modified by {112}

Chalcopyrite

{112} + {112}, modified

Chalcopyrite

Contact twin on {112} by {112}

Chalcosiderite

{110}, {010}, {001}, {111}, modified

Chalcostibite

Tabular {100}

Chalcostibite

Tabular {010}, {061}, {110}

Chalcostibite

Tabular {010}

Childrenite

{110}, {100}, {121}, {121}, modified

Childrenite

{110}, {100}, {131}, {131}, {121}, {121}

Chondrodite

{011}, {221}, {223}

Chondrodite

Highly modified crystal

Chromite

{111}

Chromite

{110}

Chrysoberyl

Contact twin on {130}

Chrysoberyl

Repeated penetration twin on {130}

Chrysoberyl

Tabular {001}

Cinnabar

{100}, {001}, {045}, {025}

Cinnabar

{011}

Cinnabar

{205}, {100}

Cinnabar

{101}, {508}, {001}, modified

Cinnabar

{102}, modified, penetration twin on {001}

Claudetite

{010}, {110}, {111}, {101}

Claudetite

Tabular {010}

Clinochlore

{101}, {100}, {001}

Clinohedrite

Clinohumite

Highly modified crystal

Cobaltite

{100}, {210}

Cobaltite

{111}, {210}

Colemanite

{110}, {011}, {221}, {111}, highly modified

Colemanite

Short prismatic [001], highly modified

Columbite

Tabular {010}, modified

Columbite

{010}, {111}, {110}, modified

Columbite

Equant

Colusite

{210}, {111}, {110), modified

Copper

{111}

Copper

{100}

Copper

{100}, modified

Copper

Contact twin on {111}

Copper

{100}, modified

Cordierite

{110}, {130}, {001}, modified

Cordierite

Prismatic [001], modified

Cordylite-(Ce)

Prismatic {100}

Cordylite-(Ce)

Parallel growth of dipyramidal crystals

Cordylite-(Ce)

{101}, {001}, modified

Corundum

Several dipyramids {hhl}

Corundum

{773}, {111}, {001}, modified

Corundum

{102}, {001}, modified

Corundum

{100}, {001}, modified

Corundum

Tabular {001}

Corundum

{111}

Corundum

Contact twin on {102}, flattened crystals

Cosalite

{100}, {010}, {301}, modified

Cotunnite

Prismatic [001]

Cotunnite

Tabular {010}

Covellite

Tabular {001}

Creedite

Prismatic {110}

Cristobalite

{111}

Crocoite

{110}, {401}, {111}

Crocoite

{110}, {111}, {111}, modified

Cryolite

{111}, {001}, modified

Cryolite

{110}, {001}, modified

Cryolithionite

{110}

Cryolithionite

{110}, {211}

Cubanite

{110}, {010}, {101}, modified

Cubanite

{100}, {110}, {001}, {011}, modified

Cuprite

{111}

Cuprite

{110}

Cuprite

{111}, {321}

Cuprite

{100}, {111}, gyroid 968

Cuprite

Cubic

Curite

Prismatic [001]

Danburite

{110}, {201}

Descloizite

{111}, {001}, modified

Descloizite

{111}, modified

Diaboleite

Tabular [001]

Diaboleite

Diamond

{111}

Diamond

{100}

Diamond

{133}

Diamond

Contact twin on {111}

Diaspore

Tabular {010}

Diaspore

Tabular {010}

Diaspore

Tabular {010}

Diaspore

Prismatic {021}

Diaspore

{140}, {131}, modified

Diaspore

Thick tabular {010}

Diaspore

Thick tabular {010}

Diopside

{100}, {010}, {001}, {221}, modified

Dioptase

Prismatic {110}, {201}

Dioptase

{110}, {201}

Dolomite

{401}, modified

Dolomite

{101}

Dolomite

Contact twin on {100}

Dolomite

{101}, modified

Dolomite

{401}, modified

Dolomite

Contact twin on {001}

Dufrenoysite

Prismatic [100], flattened {010}

Dyscrasite

{111}, {021}

Eglestonite

{110}, modified

Eglestonite

{110}, modified

Elpidite

Prismatic [001]

Elpidite

Prismatic [001]

Enargite

Short prismatic [001]

Enargite

Tabular {001}

Enargite

{110}, {001}, modified

Enstatite

Short prismatic [001]

Enstatite

Long prismatic [001]

Epididymite

Reticulated twin on {110}

Epididymite

Long prismatic {011}

Epididymite

Tabular {001}, elongated [100]

Epidote

Prismatic [010]

Epidote

Prismatic [010]

Epidote

Contact twin on {100}

Epidote

Pseudo-octahedral

Epidote

Pseudo-octahedral

Epidote

Pseudo-hexagonal tablet

Epistilbite

Mimetic twin on {100}

Epistilbite

Mimetic twin on {110}

Epistilbite

Mimetic twin on {100}

Epistilbite

{110}, {001}, modified

Epsomite

{110}, {111}, modified

Epsomite

{110}, {111}

Erythrosiderite

Tabular {100}

Ettringite

Dipyramidal {1012}

Euclase

Prismatic [100]

Euclase

{031}, {100}, modified

Euclase

prismatic {031}, modified

Eudialyte

Tabular {001}

Eudialyte

{101}, {001}, modified

Eudidymite

Tabular {001}, highly modified

Euxenite-(Y)

Tabular {010}, elongated [001]

Euxenite-(Y)

{100}, {010}, {111}, modified

Fergusonite

{230}, {111}, {001}

Fergusonite

{231}, {111}, {001}, {230}

Ferrotapiolite

Contact twin on {013}, distorted by elongation on [013]

Ferrotapiolite

{113}, {001}, {100}, {110}

Fiedlerite

Tabular {100},

Fiedlerite

Tabular {100},

Fluellite

Dipyramidal {111}

Fluocerite-(Ce)

{110}, {001}, modified

Fluorite

{100}

Fluorite

{111}

Fluorite

{110}

Fluorite

{100}, modified by {421}

Fluorite

{100}, highly modified

Fluorite

{110}, {221}, {111}

Fluorite

{100}, {310}, {311}

Fluorite

{111}, {221}

Fluorite

Penetration twin on [111]

Fluorite

Penetration twin on [111]

Franckeite

Tabular {010}, elongated [001]

Freieslebenite

{110}, {120}, {011}, {031}, modified

Freieslebenite

Contact twin on {100}

Fülöppite

Tabular {001}

Fülöppite

{100}, {112}, modified

Gadolinite

{011}, {111}, {111}, {001}, modified

Galena

{100}

Galena

{100}, {111}

Galena

{111}

Galena

{100}, {221}

Galena

Contact twin on {111}

Galena

{441}, {221}

Galena

{100}, {111}, {110}, modified

Galena

Penetration twin on [111]

Galena

Pseudohexagonal tabular contact twin on {111}

Galenobismutite

Tabular {100}

Garnet

{110}

Garnet

{211}

Garnet

{110}, {211}

Garnet

{110}, modified

Garnet

{211}, modified

Gaylussite

{011}, {112}, modified

Gaylussite

{110}, {011}, modified

Geocronite

Contact twin on {110}

Geocronite

{001}, {225}, {011}

Georgiadesite

{110}, {010}, {011}, modified

Gersdorffite

{111}, modified

Gersdorffite

{100}, {120}, {110}

Gismondine

{232}, multiple contact twin on the normal to {100} and composition planes approx. (100) and (001)

Gjerdingenite-Fe

Tabular, pseudo-orthorhombic

Glauberite

Prismatic {111}

Glauberite

Tabular {001}

Glaucodot

{110}, {021}

Glaucodot

{011}, {110}, {021}, modified

Gmelinite

{101}, {100}, {001}

Goethite

{110}, {010}, {121}, modified

Goethite

Prismatic {110}

Goethite

Gold

{111}

Gold

{100}

Gold

{100}, {111}

Gold

{210}

Gold

Contact twin on {111}

Gold

Contact twin on {111}

Goldichite

{100}, {110}, {011},

Graphite

Tabular {001}

Graphite

Dipyramidal {101}

Graphite

{101}, {001}

Graphite

{101}, {001}, modified

Gratonite

{110}, {021}

Greenockite

{100}, {001}, {001}, modified

Gudmundite

Prismatic {230}

Gypsum

{010}, {120}, {011}

Gypsum

Contact twin on {100}

Gypsum

{010}, {011}, {102}, prisms {hk0}

Gypsum

Contact twin on {001}

Gypsum

Penetration twin on {001}

Halite

{100}

Hanksite

{110}, {113}, {001}

Hanksite

{110}, {113}, {001}, {223}

Hauerite

{111}, modified

Hauerite

{100}, {111}

Hausmannite

Contact twin on {112}

Hausmannite

Fiveling contact twin on {112}

Hausmannite

{101}, modified

Hausmannite

{101}, modified

Hauyne

{110}, {100}

Hematite

Tabular {001} twinned on {102}

Hematite

Tabular {001} twinned on {102}

Hematite

{001}, {102}

Hematite

{0.1.10}, {102}, {113}, modified

Hematite

{102}, {108}, {113}, modified

Hematite

{102}, {001}

Hematite

Contact twin on {0001}, contact plane {1010}

Hemimorphite

{010}, {110}, {011}

Hemimorphite

Contact twin on {001}

Hemimorphite

Tabular {010}

Hemimorphite

{010}, {100}, {031}, {121}, modified

Herderite

{101}, {122}, {011}, {001}, modified

Herderite

Prismatic [100], highly modified

Heulandite

{010}, {001}, {201}, modified

Heulandite

{010}, {001}, {201}, modified

Hutchinsonite

Prismatic [001]

Hydrochlorborite

Tabular {001}

Ianthinite

Prismatic [010]

Ice

Prismatic {100}. Typical for high elevations and low temperatures

Ice

Tabular {001}. Typical for severe frost

Ilmenite

{102}, {113}, {001}

Ilmenite

{102}, {213}, {001}

Ilmenite

{102}, {001}, modified

Ilmenite

Tabular {001}

Ilvaite

Prismatic {110}, {011}

Ilvaite

Short prismatic c, {110}, {210}, {111}

Ilvaite

{100}, {011}, modified

Iodargyrite

{100}, {001}, {101}, modified

Jacobsite

{111}

Jacobsite

{111}, modified

Jadeite

Tabular {100}

Jadeite

Prismatic {110}

Jurbanite

{110}, {011}

Kaersutite

{010}, {110}, {011}, modified

Kaersutite

{011}, {010}, {110}, modified

Kaersutite

{110}, {010}, {011}, modified

Kaersutite

Contact twin on {100}

Kaersutite

{110}, {010}, {011}, modified

Kaersutite

Prismatic [001], with epitaxial augite

Kainite

{001}, {111}, {111}, modified

Kainite

{111}, {111}, modified

Kleinite

Prismatic {1010}

Koechlinite

Tabular {010}

Krennerite

Short prismatic [001]

Kyanite

tabular {100}

Langite

{100}, {010}, {011}

Langite

Contact twin on {011}

Langite

Repeated penetration twin on {011}

Lansfordite

{100}, {110}, {001}, modified

Lanthanite

Tabular {010}

Laumontite

{110}, {101}, modified

Laurionite

Tabular {010}, elongated [001]

Laurionite

Tabular {010}, elongated [001]

Laurionite

{100, {010}, dipyramids {1k1}

Laurionite

{010}, {110}, {281}

Laurionite

{010}, {120}, {011}, modified

Laurionite

{010}, {110}, {011}

Lautite

{010}, {340}, modified

Lazulite

{111}, {011}, modified

Lazulite

{111}, {011}, modified

Lead

{111}

Lead

{551}, modified

Leadhillite

Tabular {001}

Leadhillite

Tabular {001}

Lepidocrocite

Tabular {010}

Leucite

{211}

Leucite

{211}, {110}

Leucophanite

{110}, {001}, modified

Leucosphenite

{311}, {010}, {001}, modified

Leucosphenite

{311}, {010}, {001}, modified

Leucosphenite

Contact twin on {001}

Libethenite

{110}, {011}, {111}

Libethenite

{011}, {110}, modified

Libethenite

{011}, {110}

Linarite

Contact twin on {100}

Linarite

Prismatic [010], highly modified

Lindgrenite

Tabular {010}

Liroconite

{110}, {011}

Liroconite

Contact twin on {100}

Livingstonite

Prismatic [010]

Löllingite

Prismatic {110}

Löllingite

{110}, {101}, {011}, modified

Löllingite

Prismatic {011}

Lorandite

{110}, {201}, {201}, modified

Lorandite

Equant crystal

Lorenzenite

Prismatic [010]

Lorenzenite

Prismatic [010]

Lorenzenite

Prismatic [010]

Magnesite

{101}

Magnesite

{101}, modified

Magnesite

Short prismatic {110}

Magnetite

{100}

Magnetite

{111} modified by {110}

Magnetite

Spinel law twin

Magnetite

{111}, {432}, modified by {654}

Magnetite

{100}, {111}, {110}, modified

Magnetite

{111}, highly modified

Malachite

Contact twin on {100}

Malachite

Contact twin on {100}

Manganite

Contact twin on {012}

Manganite

Prismatic {110}

Manganite

Elongated [001]

Marcasite

Contact twin on {101}

Marcasite

Fourling twin on {101}

Marcasite

Repeated twin on {101}

Marshite

Tetrahedral

Matlockite

Tabular {001}

Melanophlogite

{100},

Melanovanadite

Prismatic [101]

Mellite

{101}, {110}, {001}

Meneghinite

Tabular {100}, elongated [001]

Metacinnabar

{211}, modified

Meyerhofferite

{100}, {101}, {111}

Miargyrite

{100}, {010}, {001}, modified

Miargyrite

equant crystal

Microcline

Manebach twin

Microlite

{111}

Microlite

{111}, {100}

Milarite

{110}, {102}, modified

Millerite

prismatic {100}

Mirabilite

Short prismatic [001]

Molybdenite

Thick tabular {001}

Molybdenite

Tabular {001}

Molybdite

{010}, {111}, {100}

Molybdite

{010}, {111}, {100}, {001}

Monazite

Isometric, highly modified

Monazite

{100}, {010}, {101}, {011}, modified

Monazite

{111}, {100}, modified

Montroydite

Elongated [010], highly modified

Montroydite

{011}, {120}, highly modified

Moschellandsbergite

{110}, modified

Moschellandsbergite

{110}, modified

Muscovite

Tabular {001}

Muscovite

{001}, {010}, {221}

Nagyagite

{001}, {101}, {011}, modified

Nagyagite

Tabular {001}

Nahcolite

Prismatic {110}

Narsarsukite

Tabular {001}

Narsarsukite

Tabular {001}

Narsarsukite

Tabular {001}

Natrolite

{110}, {111}, {111}

Nepheline

{100}, {001}, {001}, modified

Neptunite

{110}, {001}, highly modified

Neptunite

{110}, {001}, modified

Neptunite

Contact twin on {001}

Neptunite

Long prismatic {110}

Nesquehonite

Short prismatic [001]

Nickeline

Prismatic {110}

Nickeline

{100}, {101}, {001}

Nizamoffite

Elongated [001]

Olivenite

{011}, {110}

Olivenite

{011}, {100}, modified

Olivine

{010}, {021}, {110}, modified

Olivine

{100}, {010}, {021}, modified

Olmsteadite

Tabular {001}

Olmsteadite

Tabular {100}

Ordoñezite

{011}, {001}, {100}

Orpiment

{301}, {210}, {010}, modified

Orpiment

{210}, prisms {hk-l}, modified

Orpiment

Tabular {010}

Orthoclase

{110}, {101}

Orthoclase

{110}, {001}, {101}, modified

Orthoclase

{110}, {010}, {001}, {201}, modified

Orthoclase

Karlsbad law twin (left)

Orthoclase

Karlsbad law twin (right)

Orthoclase

Tabular {010}

Orthoclase

{110}, {201}, {001}

Orthoclase

Multiple Manebach- and Baveno law twin

Orthoclase

Multiple Baveno law twin

Orthoclase

Baveno law twin

Orthoclase

Tabular {010}

Orthoclase

Manebach law twin

Orthoclase

{001}, {010}, {110}, {111}, modified

Pachnolite

Contact twin on {100}

Pachnolite

Contact twin on {100}

Pachnolite

Prismatic {110}

Papagoite

{110}, {001}, {100}, {401}

Paralaurionite

Contact twin on {100}

Paralaurionite

Contact twin on {100}

Paramelaconite

Prismatic {100}

Pararammelsbergite

Tabular {001}

Paratacamite

Contact twin on {1011}

Paulingite

{110}

Pearceite

Tabular {001}

Penfieldite

Prismatic {100}

Penfieldite

{11.0.2}, {001}

Pentagonite

{110}, {201}, {001}

Pentagonite

Fivefold contact twin on {110}

Perovskite

{100}

Perovskite

{100}, modified

Pharmacosiderite

{100}, {111}

Pharmacosiderite

{100}

Phenakite

{011}, {113}, {101}, modified

Phenakite

Prismatic {110}, {101}, modified

Phillipsite

Mimetic twin {001}

Phillipsite

Sixling twin: mimetic {001}, penetration {110}

Phillipsite

Sixling twin: mimetic {001}, penetration {110}

Phillipsite

Sixling twin: mimetic {001}, penetration {110}

Phlogopite

Mica law twin

Phlogopite

Mica law twin

Phlogopite

Mica law twin

Phosgenite

{100}, {110}, {001}, modified

Phosgenite

{100}, {110}, {001}, modified

Phosgenite

{100}, {010}, {001}, modified

Phosgenite

{110}, {001}, modified

Pirssonite

Tabular {010}

Pirssonite

Prismatic {110}

Plagionite

Tabular {001}

Polybasite

Tabular {001}

Polybasite

Tabular {001}

Polybasite

Tabular {001}

Polybasite

Tabular {001}

Polycrase-(Y)

Tabular {010}

Polycrase-(Y)

{111}, modified

Potassiumalum

{100}, {111}, {110}

Potassiumalum

{111}

Potassiumalum

{111}, {110}, {100}

Powellite

Bipyramidal {112}

Powellite

Tabular {001}

Prosopite

Tabular {010}

Proustite

{110}, {101}, modified

Pseudoboleite

Epitaxial on boleite

Pseudobrookite

Tabular {100},

Pseudobrookite

Tabular {100}, elongated [001]

Pseudobrookite

Elongated [001]

Pseudobrookite

{100}, {210}, {101}

Pucherite

{111}, modified

Pucherite

{210}, {001}, modified

Pyrargyrite

{110}, {101}, modified

Pyrite

{100}

Pyrite

{111}

Pyrite

{210}

Pyrite

{210}, {111}

Pyrite

{111}, modified by {210}

Pyrite

penetration twin [110] (iron cross twin)

Pyrite

{321}, modified

Pyrite

{100}, {110}, modified

Pyrite

{100}, {210}, {211}, modified

Pyrite

{100}, highly modified

Pyrite

{111}, highly modified

Pyrite

{210} {100} {111}

Pyrochroite

Prismatic {1010}

Pyrochroite

{1012}, modified

Pyrolusite

Prismatic [001]

Pyrolusite

Prismatic {110}, {011}, {321}

Pyromorphite

{100}, {001}, modified

Pyromorphite

{100}, {001}, modified

Pyromorphite

{100}, {101}, modified

Pyrrhotite

{100}, {010}, modified

Pyrrhotite

{101}, {001}

Pyrrhotite

{100}, {001}

Pyrrhotite

Contact twin on {1012}

Quartz

{101}, {011}

Quartz

{100}, {101}, {011}

Quartz

Left-handed Dauphiné twin (mimetic twin on [001])

Quartz

{100}, {101}, {011}, modified

Quartz

Right-handed Dauphiné twin (mimetic twin on [001])

Quartz

{101}, modified

Quartz

{100}, {101}, {011}, {511}

Quartz

Japanese twin of two flattened crystals

Quartz

Japan law twin (Contact twin on {112})

Quartz

{100}, {210}, {101}, modified

Quartz

{100}, {611}, {101}, modified

Quartz

Common habit, {100}, {101}, {011}

Quenselite

Tabular {010}, elongated [001]

Raspite

{100}, {001}, {011}, modified

Raspite

Contact twin on {100}

Raspite

{100}, {001}, {011}, modified

Realgar

{110}, {101}, modified

Realgar

Highly modified

Reddingite

{111}, {{212}, {010}

Reddingite

{111}, modified

Reedmergnerite

{100}, {110], {001}, modified

Rhodochrosite

{101}

Rhodochrosite

{101}, {110}

Rhodochrosite

{321}, {211}

Rhodochrosite

{321}, {211}, {001}

Rhodonite

{100}, {010}, {001}, modified

Rhodonite

Tabular {110}, modified

Rivadavite

Elongated [010], tabular {100}

Romeite

{111}, {100}

Romeite

{111}, modified

Roselite

Thick tabular {102}

Rosickyite

Tabular {010}, elongated [001]

Rutile

{110}, {111}, modified

Rutile

{101}, {310}, {210}, {110}

Rutile

Sixling twin on {101}

Rutile

Sixling twin on {101}

Rutile

Eightling twin on {101}

Rutile

Long prismatic [001]

Rutile

Eightling twin on {101}

Rutile

Contact twin on {301}

Rutile

Contact twin on {101}

Safflorite

{110}, {011}, modified

Sal Ammoniac

{211}, modified

Sal Ammoniac

{211}, {578}, gyroidal

Sal Ammoniac

Penetration twin on {111}

Saléeite

Thick tabular {001}

Samarskite-(Y)

Samarskite-(Y)

{010}, {100}, {101}, {130}

Samsonite

Short prismatic {110}

Scapolite

{100}, {101}, modified

Scapolite

{110}, {211}, {100}, {101}, modified

Scheelite

{101}, modified

Scheelite

Bipyramidal {112}

Scheelite

Bipyramidal {112}

Scheelite

Bipyramidal {011}

Schoepite

{100}, {010}, {001}, modified

Schorl

Prismatic, hemimorphic

Scorodite

{111}, modified

Scorodite

{111}, {100}, {010}, modified

Selenium

{100}, {101}

Seligmannite

Thick tabular {001}

Sellaite

Short prismatic, modified

Shortite

{100}, {011}, {001}

Siderite

{012}, {001}

Siderite

{101}

Siderite

{051}, {101}, modified

Siderite

Short prismatic {100}

Siderite

{211}, modified

Silver

{111}

Silver

{100}

Silver

Contact twin on {111}

Skutterudite

{111}, {100}, modified

Smithite

{100}, {101}, {001}, modified

Smithsonite

{401}, modified

Smithsonite

{021}, modified

Smithsonite

{100}, {211}, modified

Smithsonite

{101}, {012}

Sperrylite

{111}, Modified

Sperrylite

{100}, {111}, {210}

Sphalerite

{110}

Sphalerite

{111}

Sphalerite

{111}, modified

Sphalerite

Twin on [111], contact plane {111}

Sphalerite

{111}, {211}

Sphalerite

{111}, modified

Sphalerite

Twin on [111], contact plane {111}

Sphalerite

{111}, {111}, {100}, {110}, modified

Sphalerite

Twin on [111], contact plane {111}

Sphalerite

{111}, {111}, modified

Spinel

{111}

Spinel

Contact twin on {111}

Spinel

{111}, highly modified

Spinel

Modified octahedron

Spodumene

{110}, {221}, {010}, modified

Stannite

{001}, {110}, {102}, modified

Staurolite

{110}, {010}, {001}, modified

Staurolite

Penetration twin on {031} and {231}

Staurolite

Penetration twin on {031}

Staurolite

Penetration twin on {231}

Stephanite

Tabular {001}, modified

Stephanite

{001}, {111}, modified

Sternbergite

Tabular {001}

Sternbergite

Contact twin on {130}

Stibiotantalite

{110}, {101}, modified

Stibnite

{110}, {331}

Stibnite

{110}, {331}, modified

Stibnite

{110}, {331}, modified

Stibnite

{110}, {331}, modified

Stibnite

{110}, {331}, {010}, modified

Stibnite

{110}, {341}, {010}, modified

Stibnite

{110}, {12.18.1}, modified

Stilbite

Mimetic twin on {001}

Stilbite

Mimetic twin on {001}

Stolzite

{100}, {201}, {101}, modified

Stolzite

{112}, {001}, modified

Strengite

{001}, {111}, {201}

Strengite

{210}, {111}

Stringhamite

{101}, {011}, modified

Strontianite

{110}, {010}, {001}, modified

Strontianite

{110}, {010}, {011}, modified

Strontianite

Highly modified

Struvite

{110}, {011}, {001}, modified

Struvite

{101}, {001}, {010}, modified

Sulfur

{111}

Sulfur

{111}, modified

Sulfur

Highly modified crystal

Sulfur

{111}, {001}

Sylvanite

{100}, {010}, {101}, {103}, highly modified

Sylvanite

{100}, {010}, {101}, highly modified

Tantalite

{170}, {001}, modified

Teallite

Tabular {010}

Tellurite

Tabular {010}

Tellurium

{012}

Tellurium

prismatic [001]

Tennantite

{100}, modified

Tenorite

{100}, {111}, {001}, modified

Tenorite

Tabular {001}

Terlinguaite

Highly modified

Tetradymite

{012}, {001}, {101}

Tetrahedrite

{211}, {100}, modified

Tetrahedrite

{111}, modified

Tetrahedrite

{211}

Tetrahedrite

{111}, modified

Tetrahedrite

{111}, {110}

Tetrahedrite

Penetration twin on [111]

Thomsenolite

{110}, {111}, {001}

Thomsenolite

{110}, {001}, {111}

Tincalconite

{1011}, {0001}

Tincalconite

{1011}, {0001}, {0112}

Titanite

{111}, {001}, modified

Titanite

{111}, {011}

Topaz

{100}, {021}, {110}, modified

Topaz

{110}, {120}, {021}, {111}, highly modified

Topaz

{120}, {001}, {011}, modified

Torbernite

Thick tabular {001}

Torbernite

Tabular {001}

Torbernite

Tabular {001}

Tourmaline

{100}, {110}, {011}, {101}, modified

Tourmaline

Prisms {hk0}, {010}, {001}

Tridymite

Penetration twin on {304}

Trona

{100}, {001}, {111}

Trona

{001}, {100}, {111}

Trona

{100}, {001}, {111}, modified

Tschernichite

{302}, {001}

Tschernichite

Contact twin on {101}

Tschernichite

Contact twin on {302}

Tschernichite

Contact twin on {304}

Tschernichite

Multiple contact twin on {101}

Turquoise

{010}, {110}, {001}, modified

Ullmannite

Multiple twin on [110], contact plane {001}

Valentinite

{100}, {110}, {122}, modified

Valentinite

Tabular {010}

Vanadinite

{100}, {101}, modified

Vanadinite

{100}, {101}, modified

Vanadinite

{100}, {110}, {101}, modified

Vesuvianite

Short prismatic

Vesuvianite

Long prismatic

Vesuvianite

{100}, {101}, modified

Vesuvianite

{100}, {101}, highly modified

Vesuvianite

{101}, {001}

Vesuvianite

{101}, {001}, {112}

Vesuvianite

{101}, modified

Vivianite

Tabular {010}, {211}

Vivianite

Prismatic [001], modified

Vivianite

Prismatic [001], highly modified

Vrbaite

Tabular {010}

Vrbaite

Dipyramidal {111}

Vuagnatite

Prismatic {110}

Wavellite

{110}, {111}

Wavellite

{110}, {121}, {100}

Wavellite

{110}, {101}, {010}, modified

Wendwilsonite

{011}, {111}, modified

Whewellite

{110}, {011}, {101}

Willemite

{110}, {121}, modified

Witherite

{110}, {021}, {010}

Witherite

{110}, {010}, several prisms {0kl}

Witherite

{110}, {010}, {111}, {021}, {011}

Witherite

Mimetic twin on {110}

Witherite

Mimetic twin on {110}

Wöhlerite

Tabular {100}

Wolframite

{100}, {110}, {001}, modified

Wolframite

Contact twin on {100}

Wolframite

{100}, {010}, {102}, modified

Wollastonite

Tabular {100}

Wollastonite

{010}, {540}, {100} modified

Wulfenite

Tabular {001}

Wulfenite

{201}

Wulfenite

Thick tabular {001}

Wulfenite

{001}, {34.75.}, {114}, {013}

Wulfenite

Tabular {001}

Wulfenite

{112}, {112}, {001}, modified

Wulfenite

{110}, {001}, {001}, overgrown with small pyramidal crystals

Wulfenite

Contact twin on {001}

Wurtzite

{101}, {001}

Xenotime

{100}, {101}

Xenotime

{100}, {101}, modified

Yttrotantalite-(Y)

Equant

Zincite

{101}, {001}, {100}

Zincite

Pyramidal

Zinkenite

Prismatic {110}

Zircon

{110}, {101}

Zircon

{100}, {110}, {101}, {112}

Zircon

Epitaxial intergrowth with Xenotime-(Y)

Zircon

{101}, {100}

Zircon

{101}, {301}

Zircon

{101}, {110}

Zircon

{110}, {101}, modified

Zircon

{100}, {301}, {101}

Zirconolite

Elongated [001]

Zirconolite

Equant

Zoisite

Short prismatic b

Zoisite

Short prismatic b

Zunyite

Positive tetrahedron

Zunyite

Positive and negative tetrahedron

Zunyite

Positive tetrahedron modified by negative tetrahedron and cube

Zunyite

Positive tetrahedron modified by the cube

Zunyite

Cube and positive tetrahedron

Zunyite

Penetration twin on [111]

Zunyite

Penetration twin on [111]

Zunyite

Penetration twin on {100}

Zunyite

Positive tetrahedron modified by negative tetrahedron and cube

Zunyite

Positive tetrahedron modified by negative tetrahedron and cube