Proustite
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Proustite is a sulfosalt mineral consisting of silver sulfarsenide, Ag₃AsS₃, known also as ruby blende, light red silver, arsenic-silver blende or ruby silver ore, and an important source of the metal. Wikipedia
Color: Scarlet-vermilion
Crystal class: Hexagonal scalenohedral (3m); H-M Symbol: (3 2/m)
Crystal habit: Crystals prismatic and scalenohedral, massive, compact
Crystal system: Trigonal
Formula (repeating unit): Ag3AsS3
Luster: Adamantine
Mohs scale hardness: 2 – 2.5
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