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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
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Merriam-Webster unabridgedWords at Play
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Time Traveler for stibnite
The first known use of stibnite was circa 1854
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