Stibnite

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Stibnite
Missing image
Stibnite_Romania.jpg
Stibnite from Herja, Romania
General
CategoryMineral
Chemical formula antimony sulfide (Sb2S3)
Identification
Colour Steel gray to dull gray. Black iridiscent tarnish may be present.
Crystal habit Massive, radiationg and elongated crystals. Massive and granular.
Crystal system Orthorhombic
Cleavage Perfect
Fracture Small-scale subconchoidal
Mohs Scale hardness 2
Luster Splendent on fresh crystals surfaces, otherwise metallic
Refractive index Opaque
Pleochroism N/A
Streak Similar to colour
Specific gravity 4.56 - 4.62
Fusibility ?
Solubility Souluble in hydrochloric acid
Major varieties
Metastibnite Earthy, reddish deposits

Stibnite, sometimes also called antimonite, is a sulfide mineral. It crystallizes in the orthorhombic system, has hardness 2 and a grey colour. Its chemical composition is described by the formula Sb2S3

Stibnite is the most important source for the rare metal antimony. It is soluble in hydrochloric acid, and is tarnished by potassium hydroxide solution.

Small deposits of Stibnite are common, large ones are rare. It occurs in Canada, Mexico, Peru, Japan, China, Germany, Romania, Italy, France, England, Algeria, and Kalimantan, Borneo. In the United States it is found in Arkansas, Idaho, Nevada, California, and Alaska.

Spectacular, large iridescent stibnite crystals are found in Japan.

See also

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