
1) Alchemical substance 2) Mineral 3) Mineral of antimony 4) Orthorhombic mineral 5) Sulfide mineral 6) The chief ore of antimony
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1) Ore
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Stibnite, sometimes called antimonite, is a sulfide mineral with the formula Sb2S3. This soft grey material crystallizes in an orthorhombic space group. It is the most important source for the metalloid antimony. The name is from the Greek stibi through the Latin stibium as the old name for the mineral and the element antimony. As an antimony sulf...
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http://en.wikipedia.org/wiki/Stibnite

• (n.) A mineral of a lead-gray color and brilliant metallic luster, occurring in prismatic crystals; sulphide of antimony; -- called also antimony glance, and gray antimony.
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antimony sulfide (Sb2S3), the principal ore of antimony. This mineral has a brilliant metallic lustre, is lead- to steel-gray in colour, and fuses ... [2 related articles]
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http://www.britannica.com/eb/a-z/s/162
Stib'nite noun (Min.) A mineral of a lead-gray color and brilliant metallic luster, occurring in prismatic crystals; sulphide of antimony; -- called also
antimony glance , and
gray antimony .
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http://www.encyclo.co.uk/webster/S/196

Stibnite (also known as antimonite, antimony glance and black antimony) is the major ore of antimony. It is Deposited by alkaline waters, usually in association with quartz. Stibnite is found in quartz veins or beds in granite and gneiss and may occur as a replacement in limestones and shales.
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Antimony sulfide, tri-
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[
n] - a soft gray mineral
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http://www.webdictionary.co.uk/definition.php?query=stibnite
noun a soft grey mineral; the chief ore of antimony
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https://www.encyclo.co.uk/local/20974
(Antimony Sulfide) Stibnite is a classic mineral species with fine crystal clusters and long curved crystals being the pride of many collectors. The slender curved metallic blades of stibnite can resemble arabian swords. The curving of the long bladed crystals is due to twinning where one twin plane bends the crystal one directi...
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https://www.encyclo.co.uk/local/23719
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