Hausmannite
Mineral Mn3O4
About it
Brownish-black, sharp, pseudo-octahedral crystals with a chestnut-brown streak. Fine specimens come from the Kalahari manganese field, South Africa, and Långban, Sweden.
- Type
- Mineral
- Group
- Oxide, spinel group
- Formula
- Mn3O4
- Hardness (Mohs)
- 5.5
- Specific gravity
- 4.7–4.86
- Streak
- chestnut to reddish brown
- Lustre
- submetallic
- Crystal system
- Tetragonal
- Colours
- brownish black, black
- Transparency
- opaque
- Cleavage and fracture
- perfect basal; uneven fracture
Typical values: real specimens vary. For more, see mindat.org.