STIBNITE
stibnite
(noun) a soft grey mineral; the chief ore of antimony
Source: WordNet® 3.1
Etymology
Noun
stibnite (countable and uncountable, plural stibnites)
A grey mineral, Sb2S3, that is the main ore of antimony; used in ancient times as the cosmetic kohl.
Synonyms
• antimonite
Source: Wiktionary
Stib"nite, n. (Min.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition