EntityQ415785· pop 19· linked from 17 articles

polybasite

Polybasite is a sulfosalt mineral of silver, copper, antimony and arsenic. Its chemical formula is .

Key facts

Mineral.name: Polybasite
Mineral.image: Polybasite-37890.jpg
Mineral.category: Sulfosalt minerals
Mineral.IMAsymbol: Plb
Mineral.strunz: 2.GB.15
Mineral.system: Monoclinic and trigonal polytypes
Mineral.class: Prismatic (2/m) (same H-M symbol)
Mineral.symmetry: C2/c
Mineral.colour: steel black
Mineral.cleavage: poor on (001)
Mineral.fracture: uneven
Mineral.mohs: 1.5–2
Mineral.lustre: metallic, adamantine or glimmering
Mineral.streak: black with reddish tint
Mineral.gravity: 6–6.2

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Polybasite is a sulfosalt mineral of silver, copper, antimony and arsenic. Its chemical formula is .

It forms black monoclinic crystals (thin, tabular, with six corners) which can show dark red internal reflections. It has a Mohs hardness of 2.5 to 3. It is found worldwide and is an ore of silver. The name comes from the number of base metals in the mineral.