Lengenbachite

lengenbachite

pyrite

sphalerite

jordanite

Images

Formula: Ag₄Cu₂Pb₁₈As₁₂S₃₉
Sulpharsenite
Crystal System: Triclinic
Specific gravity: 5.8 to 5.85 measured, 5.78 calculated
Hardness: 1½ to 2
Streak: Brown-black
Colour: Steel-grey, iridescent tarnish at times
Common impurities: Fe,Sb
Environments

Hydrothermal environments

Localities

At the type locality, the Lengenbach quarry, Fäld, Binn, Goms, Valais, Switzerland, is of hydrothermal origin, and is associated with pyrite, sphalerite and jordanite (HOM), and also with quadratite (AM 85.264).

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