{{Infobox mineral | name = Domeykite | category = Arsenide mineral | boxwidth = | boxbgcolor = | image = Domeykite.jpg | imagesize = 260px | caption = | formula = Cu<sub>3</sub>As | IMAsymbol = Do<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref> | molweight = 265.56 g/mol | system = Isometric | class = Hextetrahedral ({{overline|4}}3m) <br/>H-M symbol: ({{overline|4}} 3m) | symmetry = ''I''{{overline|4}}3d | unit cell = a = 9.62&nbsp;Å; Z&nbsp;=&nbsp;16 | strunz = 2.AA.10b | color = Tin-white to steel-gray | habit = Reniform, botryoidal; massive | cleavage = None | tenacity = Brittle – sectile | mohs = 3-3.5 | luster = Metallic | refractive = | opticalprop = | birefringence = | pleochroism = | streak = Black gray | gravity = 7.2 – 8.1, average = 7.65 | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Opaque | other = Tarnishes pale yellow, then pale brown, and finally to iridescence | references = <ref name=HBM>{{Cite web |url=http://www.handbookofmineralogy.com/pdfs/domeykite.pdf |title=Handbook of Mineralogy – Domeykite |access-date=2011-10-21 |archive-date=2016-03-03 |archive-url=https://web.archive.org/web/20160303233354/http://www.handbookofmineralogy.com/pdfs/domeykite.pdf |url-status=dead }}</ref><ref name=Mindat>[http://www.mindat.org/min-1306.html Mindat.org – Domeykite]</ref><ref name=Webmin>[http://webmineral.com/data/Domeykite.shtml Webmineral data – Domeykite]</ref> }}

'''Domeykite''' is a copper arsenide mineral, Cu<sub>3</sub>As. It crystallizes in the isometric system, although crystals are very rare. It typically forms as irregular masses or botryoidal forms. It is an opaque, white to gray (weathers brassy) metallic mineral with a Mohs hardness of 3 to 3.5 and a specific gravity of 7.2 to 8.1.<ref name=HBM/><ref name=Webmin/>

It was first described in 1845 in the Algodones mines, Coquimbo, Chile. It was named after Polish mineralogist Ignacy Domeyko (1802–1889) by Wilhelm Haidinger.<ref name=Mindat/>

== Uses == Domeykite, being a minor copper ore, is used for obtaining copper. It can also be polished and used for ornamental purposes.<ref name=galleries>[http://www.galleries.com/Domeykite galleries – Domeykite]</ref>

thumb|left|Crystal structure of domeykite [[File:Mohawkite.jpg|thumb|left|Mohawkite nugget, a mixture of domeykite, algodonite and native copper (50 × 40 × 28 mm)]]

==See also== *List of minerals *List of minerals named after people

==References== {{Reflist}}

{{Wiktionary|Domeykite}}

Category:Copper(I) minerals Category:Arsenide minerals Category:Cubic minerals Category:Minerals in space group 220

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