How many different kinds of crystals are there?

Question by Jules: How many different kinds of crystals are there?
My son is doing a science project on crystals, we need to find out how many different kinds/types of crystals there are. At least how many have been identified. I have tried looking this information up in the library, as well as the internet (maybe I am not wording right when I search) Any help would be appreciated.

Best answer:

Answer by Rixie
triclinic
monoclinic
orthorhombic
tetragonal
trigonal
hexagonal
cubic

OR Covalent, Metallic, Ionic, and Molecular
it depends on how you are catagorizing them
see the site link for more information

Try searching: different types of crystals

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