stibnite

 
Pronunciation: /ˈstɪbnʌɪt/

noun

[mass noun]
  • a lead-grey mineral, typically occurring as striated prismatic crystals, which consists of antimony sulphide and is the chief ore of antimony.

Origin:

mid 19th century: from Latin stibium 'black antimony' + -ine4 + -ite1