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A mineral takes a crystalline shape in one of six established crystal systems. Probably the most familiar shape is cubic, like you would see in a crystal of salt under a magnifying lense. Table salt is the mineral halite and is in the isometric (or cubic) crystal system. Unfortunately, because of the conditions under which a mineral forms, the crystal is not always visible without the aid of magnification. A piece of broken granite, however, usually reveals visible crystals of feldspar, mica, and quartz.

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16y ago

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