Cobaltite

from WordNet (r) 3.0 (2006)

cobaltite
    n 1: a rare silvery-white mineral; important ore of cobalt

from The Collaborative International Dictionary of English v.0.48

Cobaltine \Co"balt*ine\, Cobaltite \Co"balt*ite\n. (Min.)
   A mineral of a nearly silver-white color, composed of
   arsenic, sulphur, and cobalt.
   [1913 Webster]