Ullmannite
Mineral NiSbS
Take care.
- Toxic: Wash your hands after handling it, don't lick or taste it, and don't make dust.
About it
Steel grey nickel sulfantimonide, sometimes in sharp cubes and octahedrons. The best-known crystals come from the Sarrabus district of Sardinia, Italy.
- Type
- Mineral
- Group
- Sulfantimonide, cobaltite group
- Formula
- NiSbS
- Hardness (Mohs)
- 5–5.5
- Specific gravity
- 6.6–6.7
- Streak
- greyish black
- Lustre
- metallic
- Crystal system
- Isometric (cubic)
- Colours
- steel grey, silver white
- Transparency
- opaque
- Cleavage and fracture
- perfect cubic; uneven fracture
Typical values: real specimens vary. For more, see mindat.org.