Canfieldite

Canfieldite

Canfieldite is a rare silver tin sulfide mineral with formula: Ag8SnS6. 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.

ee also

*List of minerals
*List of minerals named after people

References

* [http://www.mindat.org/min-882.html Mindat with location data]
* [http://webmineral.com/data/Canfieldite.shtml Webmineral data]


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  • canfieldite — can·field·ite …   English syllables

  • canfieldite — ˈkanˌfēlˌdīt noun ( s) Etymology: F.A. Canfield died 1926 American mining engineer, + English ite : a mineral Ag8SnS6 consisting of silver thiostannate isomorphous with the germanium mineral argyrodite that occurs in black metallic octahedrons… …   Useful english dictionary

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  • Argyrodite — Infobox mineral name = Argyrodite category = boxwidth = boxbgcolor = imagesize = caption = formula = silver germanium sulfide:Ag8GeS6 molweight = color = Black, purplish tinge habit = tetrahedron or rhombic dodecahedron system = Orthorhombic… …   Wikipedia

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