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copper pyrites

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.05 sec.
copper pyrites: see chalcopyrite chalcopyrite (kăl'kəpī`rīt, kăl`kōpī'rīt) or copper pyrites
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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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