Sentence Examples

  • The principal ores of copper are the oxides cuprite and melaconite, the carbonates malachite and chessylite, the basic chloride atacamite, the silicate chrysocolla, the sulphides chalcocite, chalcopyrite, erubescite and tetrahedrite.
  • Chrysocolla contains in the pure state 30% of the metal; it is an abundant ore in Chile, Wisconsin and Missouri.
  • Dioptase and chrysocolla (q.v.) are the most important forms.
  • These mountains are still the chief source of copper, but the ores, chiefly cuprite, malachite and chrysocolla, are also found in various parts of the Piedmont region.

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