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Formula: FePb3Sn4Sb2S14
Sulphosalt, cylindrite group
tin- and antimony- bearing mineral
Crystal System: Triclinic
Specific gravity: 5.43 to 5.49 measured, 5.443 calculated
Hardness: 2½
Streak: Black
Colour: Grey-black
Common impurities: Ag
Environments:
Cylindrite occurs in tin-bearing hydrothermal veins (Webmin, HOM), associated with
franckeite,
stannite, teallite,
jamesonite, boulangerite,
cassiterite, galena,
pyrite and sphalerite (HOM, Mindat).
The type locality is the Santa Cruz Mine, Poopó town, Poopó Province, Oruro, Bolivia.
At Llallagua, Bolivia, cylindrite has been found on stannite accompanied by
franckeite (MinRec 37.2.133).
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