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countable and uncountable, plural chalcocites
(mineralogy) Cuprous sulfide, Cu2S, an important ore of copper. quotations examples
Their croppings are either entirely barren or contain only a moderate amount of copper, but much richer ore is ordinarily found just above the chalcocite zone.
1905, Waldemar Lindgren, The Copper Deposits of the Clifton-Morenci District, Arizona, page 207