Stibnite

Encyclopedia : S : ST : STI : Stibnite

Stibnite
General
Category	Mineral
Chemical formula	antimony sulfide (Sb2S3)
Identification
Colour	Steel gray to dull gray. Black iridiscent tarnish may be present.
Crystal habit	Massive, radiating 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 with the chemical composition Sb₂S₃. It crystallizes in the orthorhombic system, has hardness 2 and a grey colour.

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. Large iridescent stibnite crystals are found in Japan.

Stibnite in the American Museum of Natural History

See also

• List of minerals

From Wikipedia, the Free Encyclopedia. Original article here. Support Wikipedia by contributing or donating.
All text is available under the terms of the GNU Free Documentation License See Wikipedia Copyrights for details.