Webster's English Dictionary

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stibnite

stib.nite \'stib-.ni-t\ n [alter. of obs. E stibine stibnite, fr. F, fr. L 
   stibium antimony,]fr. Gk stibi, fr. Egypt stsub-dot>m : a mineral Sb2S3 
   consisting of antimony trisulfide occurring  in orthorhombic lead-gray 
   crystals of metallic luster and also massive