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Formula: Ag2FeSnS4
Sulphide, stannite group, forms a series with
pirquitasite, tin-bearing mineral
Crystal System: Tetragonal
Specific gravity: 4.77 calculated
Hardness: 4
Colour: Brownish grey
Common impurities: Zn,Cu
Environments
Hocartite is of relatively high-temperature origin, typically in hydrothermal
tin-bearing deposits. Associated minerals include
cassiterite, cylindrite,
franckeite, suredaite,
stannite, canfieldite,
tetrahedrite, pyrargyrite,
silver, sphalerite,
wurtzite, siderite and
fluorite
(HOM).
Localities
At the type locality, the Chocaya mine, Chocaya-Animas, Sud Chichas Province, Potosí, Bolivia, hocartite occurs
at the tin mines in grains less than a millimetre in size, as inclusions in
sphalerite and wurtzite, and in
oriented intergrowths with stannite
(AM 54.573).
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