stibnite

noun
stib·nite | \ ˈstib-ˌnīt \

Definition of stibnite 

: a mineral that consists of the trisulfide of antimony and occurs in orthorhombic lead-gray crystals of metallic luster or in massive form

First Known Use of stibnite

circa 1854, in the meaning defined above

History and Etymology for stibnite

alteration of obsolete English stibine stibnite, from French, from Latin stibium antimony, from Greek stibi, from Egyptian sṭm

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The first known use of stibnite was circa 1854

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occurring twice a year or every two years

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