a soft greyish mineral consisting of antimony sulphide in orthorhombic crystalline form. It occurs in quartz veins and is the chief ore of antimony. Formula: Sb2S3
Word origin
C19: from obsolete stibine stibnite + -ite1
stibnite in American English
(ˈstɪbˌnaɪt)
noun
a soft, shiny, metallic-gray, orthorhombic mineral, Sb2S3, often found in long, pointed crystals; antimony sulfide