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.
| Cylindrite | |
|---|---|
| General | |
| Category | Sulfosalt minerals |
| Formula (repeating unit) | Pb3Sn4FeSb2S14 |
| IMA symbol | Cy |
| Strunz classification | 2.HF.25a |
| Dana classification | 03.01.04.01 |
| Crystal system | Triclinic |
| Identification | |
| Formula mass | 1,844.71 g/mol |
| Colour | Lead grey, greyish black |
| Crystal habit | Cylindrical |
| Cleavage | Perfect on {100} |
| Tenacity | Malleable |
| Mohs scale hardness | 2+1⁄2 |
| Lustre | Metallic |
| Streak | Black |
| Diaphaneity | Opaque |
| Specific gravity | 5.4 – 5.42 |
| References | |
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.
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