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pointgroups

forms

2/m

m

2

c pinacoid

+ - +

a pinacoid

+ - +

b pinacoid

+ + -

3d order prism

+ - -

2nd order pinacoid

+ - +

1st order prism

+ - -

4th order prism

+ - -

c pedion

- + -

a pedion

- + -

3d order doma

- + -

2nd order pedion

- + -

1st order doma

- + -

4th order doma

- + -

b pedion

- - +

3d order sphenoid

- - +

1st order sphenoid

- - +

4th order sphenoid

- + -