copper pyrites

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copper pyrites

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

copper pyrites

(ˈpaɪraɪts)

(Minerals) (functioning as singular) another name for chalcopyrite

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

chal•co•py•rite

(ˌkæl kəˈpaɪ raɪt)

n.

a common mineral, copper iron sulfide, CuFeS₂, occurring in brass-yellow crystals or masses: the most important ore of copper; copper pyrites.

[1825–35]

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Noun

copper pyrites - a yellow copper ore (CuFeS2) made up of copper and iron sulfide

chalcopyrite

atomic number 29, copper, Cu - a ductile malleable reddish-brown corrosion-resistant diamagnetic metallic element; occurs in various minerals but is the only metal that occurs abundantly in large masses; used as an electrical and thermal conductor

mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition

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My host says that the two principal improvements introduced by foreigners have been, first, reducing by previous roasting the copper pyrites -- which, being the common ore in Cornwall, the English miners were astounded on their arrival to find thrown away as useless: secondly, stamping and washing the scoriae from the old furnaces -- by which process particles of metal are recovered in abundance.

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3 and 6: Black quartz and white quartz from the Jebel el-Abyaz, gave no results except a small portion of copper pyrites in a lump of quartz.