stibnite

Noun
  1. A soft grey mineral;
    The chief ore of antimony (synset 115085016)
    is a type of: mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
    substance holonym: antimony, atomic number 51, sb - a metallic element having four allotropic forms; used in a wide variety of alloys; found in stibnite

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