crocoite

crocoite

[kroh-koh-ahyt, krok-oh-]
noun
a yellow, orange, or red mineral, lead chromate, PbCrO 4 , formed by replacement.
Also called crocoisite [kroh-koh-uh-zahyt, krok-oh-] .


Origin:
1835–45; < Greek krokó(eis) saffron-colored + -ite1; see crocus

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crocoite or crocoisite (ˈkrəʊkəʊˌaɪt, krəʊˈkəʊɪˌsaɪt, ˈkrəʊkwəˌsaɪt)
 
n
Also called: red-lead ore a rare orange secondary mineral consisting of lead chromate in monoclinic crystalline form. Formula: PbCrO4
 
[C19: from Greek krokoeis saffron-coloured, golden + -ite1]
 
crocoisite or crocoisite
 
n
 
[C19: from Greek krokoeis saffron-coloured, golden + -ite1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

crocoite

mineral consisting of lead chromate, PbCrO4, that is identical in composition to chrome yellow, the artificial product used in paint. The element chromium was discovered in this mineral in 1797. Crocoite occurs as long, well-developed, prismatic crystals; the most beautiful specimens are from Dundas, Tasmania. Other localities include the Urals, Brazil, and the southwestern United States. Crocoite has a bright hyacinth-red to orange colour and an adamantine to vitreous lustre that dulls on exposure to sunlight.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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