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chromate mineral

any member of a small group of rare inorganic compounds that have formed from the oxidation of copper-iron-lead sulfide ores containing minor amounts of chromium. A noteworthy occurrence is at Dundas, Tasmania, known for its large, brilliant orange prismatic crystals of crocoite; of trivial economic importance, crocoite is one of the most highly prized of minerals among collectors and museums.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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