{{Short description|Silver tin sulfide mineral}} {{Infobox mineral | name = Canfieldite | image = Canfieldite-21373.jpg | imagesize = 260px | alt = | caption = Canfieldite | category = Sulfide minerals | formula = Ag<sub>8</sub>SnS<sub>6</sub> | IMAsymbol = Cfi<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 = | strunz = 2.BA.70 | system = Orthorhombic | class = Pyramidal (mm2) <br/><small>(same H-M symbol)</small> | symmetry = ''Pna2''<sub>1</sub> | unit cell = | color = Steel gray with reddish tint | colour = | habit = | twinning = | cleavage = | fracture = Irregular/ uneven, conchoidal | tenacity = Brittle | mohs = {{frac|2|1|2}} | luster = Metallic | streak = Greyish black | diaphaneity = Opaque | gravity = | density = 6.2 – 6.3&nbsp;g/cm<sup>3</sup> | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = <ref>[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Canfieldite Mineralienatlas]</ref><ref>[http://www.mindat.org/min-882.html Mindat with location data]</ref><ref>[https://webmineral.com/data/Canfieldite.shtml Webmineral data]</ref> }}

'''Canfieldite''' is a rare silver tin sulfide mineral with formula: Ag<sub>8</sub>SnS<sub>6</sub>. The mineral typically contains variable amounts of germanium substitution in the tin site and tellurium in the sulfur site. There is a complete series between canfieldite and its germanium analogue, argyrodite. It forms black orthorhombic crystals which often appear to be cubic in form due to twinning. The most typical form is as botryoidal rounded grape-like masses. Its Mohs hardness is 2.5 and the specific gravity is 6.28. Canfieldite exhibits conchoidal fracturing and no cleavage.

Canfieldite was first described in 1893 from an occurrence in Colquechaca, Potosí Department, Bolivia. It was named for Frederick Alexander Canfield (1849–1926), an American mining engineer.

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

==References== {{reflist}}

Category:Silver minerals Category:Tin minerals Category:Sulfide minerals Category:Orthorhombic minerals Category:Minerals in space group 33

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