polybasite
Sign in to savePolybasite 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.
Excerpted from Wikipedia’s “polybasite” article, available under the CC BY-SA 4.0 licence.