algodonite
{{Infobox mineral
| name = Algodonite
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| image = Algodonit - Houghton County, Michigan, USA.jpg
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| caption = Algodonite – Houghton County, Michigan, US
| category = Sulfide mineral
| formula = Cu6As
| molweight = 456.2 g/mol
| strunz = 2.AA.10a
| dana =
| system = Hexagonal
| class = Dihexagonal dipyramidal (6/mmm)
H-M symbol: (6/m 2/m 2/m)
| symmetry = P63/mmc
| unit cell = a = 2.6, c = 4.228 [Å]; Z = 2
| color = Gray, silver white, steel gray, tarnishes dull bronze
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| habit = Massive, granular. Common texture observed in granite and other igneous rock
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| fracture = Sub-conchoidal
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| mohs = 4
| luster = Metallic
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| diaphaneity = Opaque
| gravity = 8.38 (measured), 8.72 (calculated)
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| other = Non-magnetic, non-fluorescent
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| references = [http://webmineral.com/data/Algodonite.shtml Algodonite]. Webmineral[http://www.mindat.org/min-114.html Algodonite]. Mindat.org{{cite journal|url=http://www.minsocam.org/MSA/collectors_corner/arc/rammelsbergite.htm |author=Williams, Sidney A. |year=1963|title=Crystals of rammelsbergite and algodonite|journal= American Mineralogist|volume =48|pages=421–422}}
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Algodonite is a copper arsenide mineral with formula: Cu6As. It is a gray white metallic mineral crystallizing in the hexagonal system. It has a Mohs hardness of 4 and a specific gravity of 8.38 – 8.72.
It was first described in 1857 from the Algodones silver mine, Coquimbo, Chile.