Quadratite

quadradite

jordanite

lengenbachite

hatchite

Formula: AgCdAsS₃
Valence: Ag¹⁺Cd²⁺As³⁺S^2-₃
Sulpharsenite, cadmium-bearing mineral
Crystal System: Tetragonal
Specific gravity: 5.31 calculated
Hardness: 3
Streak: Reddish brown
Colour: Grey, reddish grey
Environments

Hydrothermal environments

Although quadradite was approved in 1994, to date (February 2026) it has been reported only from the type locality.

Localities

At the type locality, the Lengenbach Quarry, Fäld, Binn, Goms, Valais, Switzerland, quadradite occurs in cavities in hydrothermally altered dolostone, likely formed at a late stage. Associated minerals include galena, dolomite, jordanite, pyrite, sphalerite, lengenbachite and hatchite (HOM, Mindat).
Quadratite from the Lengenbach Quarry - Image

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