The Collaborative International Dictionary
copper glance
Chalcocite \Chal"co*cite\, n. [Gr. chalko`s brass.] (Min.) Native copper sulphide, called also copper glance, and vitreous copper; a mineral of a black color and metallic luster. [Formerly written chalcosine.]
WordNet
copper glance
n. a heavy gray mineral that is an ore of copper [syn: chalcocite]