Stephanite
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Stephanite is a silver antimony sulfosalt mineral with formula: Ag₅SbS₄. It is composed of 68.8% silver, and sometimes is of importance as an ore of this metal. Wikipedia
Crystal class: Pyramidal (mm2); H-M symbol: (mm2)
Crystal habit: Tabular, pseudo-hexagonal crystals; massive
Crystal system: Orthorhombic
Formula (repeating unit): Ag5SbS4
Optical properties: Anisotropic in polished section
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