Chalcostibite
Mineral CuSbS2
Take care.
- Toxic: Wash your hands after handling it, don't lick or taste it, and don't make dust.
About it
Lead-grey bladed crystals with a blue or green tarnish, easily taken for stibnite. Named for its copper and antimony; fine crystals come from Rar el Anz, Morocco.
- Type
- Mineral
- Group
- Sulfosalt
- Formula
- CuSbS2
- Hardness (Mohs)
- 3–4
- Specific gravity
- 4.9–5
- Streak
- black
- Lustre
- metallic
- Crystal system
- Orthorhombic
- Colours
- lead grey, iron grey, blue to green tarnish
- Transparency
- opaque
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.