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Short "hint"

n. - A heavy grey mineral that is an ore of copper.

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Usage examples (37)
  • "chalcocite" of our present metallurgical science, which is a sulphide containing very nearly eighty per cent. of copper.
  • The copper in these deposits occurs as primary chalcopyrite (CuFeS2) or the important secondary copper mineral chalcocite (Cu2S).
  • At Butte for instance, secondary chalcocite is clearly to be recognized.
  • Near surface copper values are associated with the presence of chalcocite.
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