From The Gemology Project
Revision as of 07:43, 9 March 2006 by Africanuck (talk | contribs) (Mineral definition)
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Natural materials that are inorganic and crystalline. These are formed within the earth or on it's surface by geological processes.

The term mineral excludes materials of organic origin, such as pearls, amber and ammolite (??). It also excludes non-crystalline materials such as glass (how about obsidian and moldovite?? and where does opal fit into this?), and man-made versions of natural minerals, such as synthetic sapphire, synthetic emerald, cubic zirconia and the like.