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Formula: SnS2
Sulphide, melonite group,
tin-bearing mineral
Crystal System: Trigonal
Specific gravity: 4.5 measured, 4.55 calculated
Hardness: 1 to 2
Streak: Golden yellow
Colour: Yellow-brown
Environments
Pegmatites
Hydrothermal environments
Berndtite is a secondary mineral commonly associated with
stannite, pyrite,
cassiterite and sulphur
(HOM, Mindat).
Localities
At the type locality, Cerro de Potosí, Potosí City, Potosí, Bolivia, berndtite occurs as a
secondary mineral in tin sulphide ores as very fine inclusions
in pyrite which has replaced stannite
(AM 50.2107).
At the Arandis tin mine, Arandis Constituency, Erongo Region, Namibia, berndtite occurs in a high-temperature
deposit, hydrothermally altered
(HOM).
At Lagares do Estanho Mines, Queiriga, Vila Nova de Paiva, Viseu, Portugal, berndtite occurs as a
secondary mineral in a tin-bearing
pegmatite
(HOM).
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