Cylindrite

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.

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It was first discovered in the Santa Cruz mine, Oruro Department, Bolivia in 1893. The name arises from its curious cylindrical crystal form it almost unique among mineral kingdom.

References

• Mineral galleries
• Webmineral data
• Mindat