General Information:
Chemical Formula:TlCu(Zn,Fe,Hg)2As2S6
Environment:In small cavities of hydrothermal origin in Triassic dolomite.
IMA Status:Approved IMA 1987
Locality:Lengenbach, Binntal, Canton Wallis, Switzerland.
Name Origin:For Prof. Dr. Hans A. Stalder (1925-) of the Natural History Museum, Berne, Switzerland.
Physical Properties: Cleavage:None
Color:black, reddish black, or bluish black.
Density:4.97
Diaphaniety:Opaque
Habits:Euhedral Crystals - Occurs as well-formed crystals showing good external form., Crystalline - Fine - Occurs as well-formed fine sized crystals.,
Hardness:3.5-4 - Copper Penny-Flourite
Luminescence:Non-fluorescent.
Luster:Metallic
Streak:brownish red
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