Cobaltite
Mineral CoAsS
Take care.
- Contains arsenic: Wash your hands after handling it, don't make dust, and never heat it.
About it
Pinkish silver-white crystals shaped like pyrite's, as pyritohedrons and cubes. Classic crystals come from Tunaberg and Håkansboda, Sweden, and Cobalt, Ontario.
- Type
- Mineral
- Group
- Sulfarsenide, cobaltite group
- Formula
- CoAsS
- Hardness (Mohs)
- 5.5
- Specific gravity
- 6–6.4
- Streak
- greyish black
- Lustre
- metallic
- Crystal system
- Orthorhombic
- Colours
- silver white with a reddish tint, steel grey
- Transparency
- opaque
- Cleavage and fracture
- perfect cubic; uneven fracture
Typical values: real specimens vary. For more, see mindat.org.