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Formula: (Cu,Fe)2Pb26.4(Bi,Sb)19.6S57
Valence: (Cu1+,Fe2+)2Pb2+26.4(Bi3+,Sb3+)19.6S2-57
Sulphosalt, kobellite homologous series group,
bismuth- and antimony- bearing
mineral, forms a series with izoklakeite
Crystal System: Monoclinic
Specific gravity: 7.45 calculated
Hardness: 2½
Streak: Greyish black
Colour: Greyish black
Common impurities: Fe
Environments
Giessenite is of hydrothermal origin, with other sulphides. Associated minerals include
galena, pyrite,
pyrrhotite, sphalerite,
tennantite, seligmannite,
geocronite, quartz and
dolomite
(HOM).
Localities
At the type locality, Turtschi, Giessen, Binn, Goms, Valais, Switzerland, giessenite occurs as fine needles
in dolostone, associated with
dolomite, galena,
geocronite, pyrite,
pyrrhotite, quartz,
seligmannite, sphalerite
and tennantite subgroup minerals
(AM 50 264, Mindat).
Giessenite from Turtschi - Image
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