Argyrodite
Chemical compound
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Argyrodite is an uncommon silver germanium sulfide mineral with formula Ag₈GeS₆. The color is iron-black with a purplish tinge, and the luster metallic. Wikipedia
Crystal system: Orthorhombic
Color: Black, purplish tinge
Crystal class: Pyramidal (mm2); H-M symbol: (mm2)
Crystal habit: Pseudo-octahedra or pseudo-cubic, dodecahedra, cubes; radiating crystal aggregates, botryoidal crusts, or massive
Formula (repeating unit): Ag8GeS6
Space group: Pna21
Strunz classification: 2.BA.35