Sulphosalt, routhierite group, thallium- and arsenic- bearing mineral
Specific gravity: 4.97 calculated
Hardness: 3½ to 4
Colour: Black with a blue and red iridescence
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).
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