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There's more than one way to categorize a crystal! The two most common methods are to group them according to their crystalline structure and to to group them according to their chemical/physical properties:
Crystal Grouped by Lattices (Shape)
There are seven crystal lattice systems. You can view examples of each type by following one of the 'Elsewhere on the Web' links I have provided.
Cubic or Isometric - not always cube shaped!...
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