Gudmundite

gudmundite

boulangerite

sphalerite

kermesite

Images

Formula: FeSbS
Sulphide, arsenopyrite group
Specific gravity: 6.72
Hardness: 5½ to 6
Streak: Greyish black
Colour: Silver-white to steel-gray
Common impurities: Ni
Environments

Hydrothermal environments

Gudmundite is a late-stage hydrothermal mineral formed in sulphide deposits. Associated minerals include pyrite, pyrrhotite, chalcopyrite, antimony, bismuth, kermesite, arsenopyrite and electrum (HOM). Localities

At the type locality, Gudmundstorp, Sala, Västmanland County, Sweden, gudmundite was found in a small lead-zinc occurrence, in calcite veins in skarn. Associated minerals include galena, sphalerite, pyrite and boulangerite. Arsenopyrite is present in the skarn but not in the veins (AM 13.592-593).

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