Minerals & Gemstone 480x104
Minerals & Gemstone 480x104
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Glossary of Terms
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Mineral
Any naturally occurring, three dimensional, inorganic substance, with a chemical structure that can be exact, or can vary within limits. Elements that occur naturally are also listed as minerals. There are a few substances that lack one of these definitions but are still generally classified as a mineral, such as Opal, which lacks a definitive chemical structure.

See "What Defines a Mineral" for additional information.




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