jamesonite


From The Collaborative International Dictionary of English v.0.48:

Jamesonite \Ja"me*son*ite\, n. [From Prof. Jameson, of
   Edinburgh.] (Min.)
   A steel-gray mineral, of metallic luster, commonly fibrous
   massive. It is a sulphide of antimony and lead, with a little
   iron.
   [1913 Webster]
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