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Cylindrite - San Francisco Mine, Poopó town, Oruro Department, Bolivia.JPG
Category Sulfosalt minerals
(repeating unit)
Strunz classification 2.HF.25a
Dana classification
Crystal system Triclinic
Formula mass 1,844.71 g/mol
Colour Lead grey, greyish black
Crystal habit Cylindrical
Cleavage Perfect on {100}
Tenacity Malleable
Mohs scale hardness
Lustre Metallic
Streak Black
Diaphaneity Opaque
Specific gravity 5.4 - 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[edit]


  1. ^ Mineral galleries
  2. ^ "Cylindrite Mineral Data". Retrieved 2015-11-24. 
  3. ^ "Cylindrite: Cylindrite mineral information and data". Retrieved 2015-11-24.