pyromorphite

pyromorphite

[pahy-ruh-mawr-fahyt]
noun
a mineral, lead chlorophosphate, Pb 5 P 3 O 1 2 Cl, occurring in crystalline and massive forms, and of a green, yellow, or brown color; green lead ore: a minor ore of lead.

Origin:
1805–15; < German Pyromorphit. See pyro-, morph-, -ite1

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pyromorphite (ˌpaɪrəʊˈmɔːfaɪt)
 
n
a green, yellow, brown, or grey secondary mineral that consists of lead chloro-phosphate in the form of hexagonal crystals. Formula: Pb5Cl(PO4)3
 
[C19: from German Pyromorphit, from pyro- + Greek morphē form + -ite1, an allusion to the fact that it assumes a crystalline form when heated]

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pyromorphite

phosphate mineral, lead chloride phosphate [Pb5(PO4)3Cl], that is a minor ore of lead. It occurs with galena, cerussite, and limonite in the oxidized zone of lead deposits, where it forms very brightly coloured, heavy, barrel-shaped crystals or globular masses. For properties, see phosphate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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