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Formula: TlCu(Zn,Fe,Hg)2As2S6
Sulphosalt, sulpharsenite,
routhierite group,
thallium-bearing mineral
Crystal System: Tetragonal
Specific gravity: 4.97 calculated
Hardness: 3½ to 4
Streak: Brown-red
Colour: Black with a blue and red iridescence
Environments
Localities
At the type locality, the Lengenbach Quarry, Fäld, Binn, Goms, Valais, Switzerland, stalderite was found in
small cavities of hydrothermal origin in dolomite. It is associated with
other thallium and arsenic minerals
such as hutchinsonite,
hatchite, realgar and
orpiment in druses in dolomite
(AM 81.1015).
Stalderite from Lengenbach - Image
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