No diclinic crystal system?

I'm studying crystal structures, and I can't quite understand why there is no diclinic crystal system. Some searching on the internet reveals that the diclinic is a form of triclinic, but I can't see why. Can anyone help?

Reply 1

-Kav-

12

It's a conceptual thing, just. You can see it best if you try to make 3D models of monoclinic, diclinic and triclinic structures. The moment you try to put in 2 angles that aren't 90º, the third one can't be 90º. Hence, any doubly oblique structure is automatically triply oblique. It's just very hard to put in systematic terms.

Reply 2

LucasP

Original post by -Kav-

It's a conceptual thing, just. You can see it best if you try to make 3D models of monoclinic, diclinic and triclinic structures. The moment you try to put in 2 angles that aren't 90º, the third one can't be 90º. Hence, any doubly oblique structure is automatically triply oblique. It's just very hard to put in systematic terms.

What about the attached pic then? What is that classified as?

WIN_20180210_19_13_11_Pro.jpg40.8KB

No diclinic crystal system?

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