Cobaltite
| Colour | Gray, Silver |
|---|---|
| Mohs hardness | 5.5 |
| Lustre | Metallic |
| Streak | Grayish-black |
| Crystal system | Orthorhombic |
| Transparency | Opaque |
| Cleavage | Perfect on {001} |
| Fracture | Uneven |
| Chemical formula | CoAsS |
| Specific gravity | 6.33 g/cm 3 |
What is Cobaltite?
Cobaltite is an arsenide and sulfide mineral with the mineral formula CoAsS. It is the naming mineral of the cobaltite group of minerals, whose members structurally resemble pyrite (FeS2).
How to identify Cobaltite
- Lustre: Metallic.
- Hardness: Mohs 5.5 — about as hard as a steel knife.
- Streak: Grayish-black.
- Habit: Orthorhombic crystal system.
Cobaltite in different forms
Stones often confused with Cobaltite
Frequently asked questions
How hard is Cobaltite?
Cobaltite is Mohs 5.5 on the hardness scale.
What colour is Cobaltite?
Cobaltite is typically gray, silver (Reddish silver white, violet steel gray to black).