Chemistry:Cylindrite

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Cylindrite
Cylindrite - San Francisco Mine, Poopó town, Oruro Department, Bolivia.JPG
General
CategorySulfosalt minerals
Formula
(repeating unit)
Pb3Sn4FeSb2S14
Strunz classification2.HF.25a
Dana classification03.01.04.01
Crystal systemTriclinic
Identification
Formula mass1,844.71 g/mol
ColourLead grey, greyish black
Crystal habitCylindrical
CleavagePerfect on {100}
TenacityMalleable
Mohs scale hardness2 12
Metallic|re|er}}Metallic
StreakBlack
DiaphaneityOpaque
Specific gravity5.4 - 5.42
References[1][2][3]

Cylindrite is a sulfosalt mineral containing tin, lead, antimony and iron with formula: Pb3Sn4FeSb2S14. It forms triclinic pinacoidal crystals which often occur as tubes or cylinders which are in fact rolled sheets. It has a black to lead grey metallic colour with a Mohs hardness of 2 to 3 and a specific gravity of 5.4.

It was first discovered in the Santa Cruz mine, Oruro Department, Bolivia in 1893. The name arises from its curious cylindrical crystal which it forms almost uniquely among minerals.

See also

References