Images
Formula: FeSbS
Sulphide, arsenopyrite group
Crystal System: Monoclinic
Specific gravity: 6.72 measured, 6.95 calculated
Hardness: 5½ to 6
Streak: Greyish black
Colour: Silver-white to steel-gray
Common impurities: Ni
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).
Back to Minerals