a soft mineral, antimony sulfide, Sb 2 S 3 , lead-gray in color with a metallic luster, occurring in crystals, often acicular, or in bladed masses: the most important ore of antimony.

1850–55; stib(i)ne (in obsolete sense “stibnite”) + -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stibnite (ˈstɪbnaɪt)
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
[C19: from obsolete stibine stibnite + -ite1]

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Example sentences
Stibnite is the predominant ore mineral of antimony.
In areas where stibnite has been exposed to the atmosphere, it is converted to
  an oxide.
Most stibnite of the hypogene deposits is oxidized to one or more of the
  antimony oxides.
It is sometimes found natively, but more frequently it is found as the sulfide
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