'Stibnite' definitions:

Definition of 'stibnite'

(from WordNet)
noun
A soft grey mineral; the chief ore of antimony

Definition of 'Stibnite'

From: GCIDE
  • Stibnite \Stib"nite\, n. (Min.) A mineral of a lead-gray color and brilliant metallic luster, occurring in prismatic crystals; sulphide of antimony; -- called also antimony glance, and gray antimony. [1913 Webster]