Spryite

spryite

Images

Formula: Ag₈(As³⁺_0.5As⁵⁺_0.5)S₆
Valence: Ag¹⁺₈(As³⁺_0.5As⁵⁺_0.5)S^2-₆
Sulphide, argyrodite group, silver- and arsenic- bearing mineral
Crystal System: Orthorhombic
Specific gravity: 6.334 calculated
Hardness: 2½ to 3
Colour: Black
Luminescence: Not fluorescent under UV
Common impurities: Ge
Environments

Hydrothermal environments

Localities

At the type locality, the Uchucchacua Mine, Uchucchacua area, Oyón District, Oyón Province, Lima, Peru, spryite occurs in a hydrothermal silver - germanium - manganese deposit, associated with proustite, argyrodite, galena and manganese-bearing calcite (HOM).
Spryite from the Uchucchacua Mine - Image

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