gray copper ore

1 definition found

gray copper ore - Collaborative International Dictionary of English v.0.48 :

  Tetrahedrite \Tet`ra*he"drite\, n. [So called because the
     crystals of the species are commonly tetrahedrons.] (Min.)
     A sulphide of antimony and copper, with small quantities of
     other metals. It is a very common ore of copper, and some
     varieties yield a considerable presentage of silver. Called
     also gray copper ore, fahlore, and panabase.
     [1913 Webster]