Argentopearceite

argentopearceite

proustite

acanthite

fluorite

Images

Formula: [Ag₉AgS₄][Ag₆As₂S₇]
Valence: [Ag¹⁺₉Ag¹⁺S^1-₄][Ag¹⁺₆As³⁺₂S^1-₇] (reference RRUFF, but surely S^2-)
Sulphosalt, sulpharsenite, pearceite-polybasite group, silver-bearing mineral
Crystal system: Trigonal
Specific gravity: 6.29 calculated
Hardness: 3
Colour: Steel-grey to black
Environments

Metamorphic environments
Hydrothermal environments

Argentopearceite was approved in 2020 but to date (January 2026) it is still pending publication.

Localities

There are two co-type localities, the Lehnschafter mine, Mikulov, Teplice District, Ústí nad Labem Region, Czech Republic, and the Moldava deposit, Moldava, Teplice District, Ústí nad Labem Region, Czech Republic.
At the type localities argentopearceite occurs as tabular (pseudo)hexagonal crystals up to 0.8 mm (Mikulov) and 3 mm (Moldava) in size, in groups and aggregates up to 1 cm in size. The ore district is represented by the quartz dominated As-Ag-Pb veins, located in gneisses of the crystalline mantle of Fláje granite massif. Associated minerals include proustite, quartz, acanthite and fluorite (Mindat).
Argentopearceite from the Moldava deposite - Image

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