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Nonmetallic mineral resources
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Gem resources
Deposits of rare minerals prized for their color, durability, sparkle, and clarity when cut and polished and used as ornaments or jewelry.
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Related topics:
Economic geology
Mineralogy
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Natural gemstones
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Online booklet on natural gemstones, terminology, geologic environment, birthstones, U.S. production, chemical formulas, and references.
Western Region Mineral Resources Project listing
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Links to ongoing mineral resources projects in the Western Region of the United States plus links to offices and staff of the Western Mineral Resources Team.
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