Hetaerolite
Mineral ZnMn2O4
About it
Black pseudo-octahedral crystals and fibrous crusts of zinc manganese oxide in oxidized zinc ores. Named from the Greek for 'companion', since it was first found with chalcophanite at Sterling Hill, New Jersey.
- Type
- Mineral
- Group
- Oxide, spinel group
- Formula
- ZnMn2O4
- Hardness (Mohs)
- 6
- Specific gravity
- 4.85–5.2
- Streak
- brownish black
- Lustre
- submetallic
- Crystal system
- Tetragonal
- Colours
- black
- Transparency
- opaque
- Cleavage and fracture
- indistinct basal
Typical values: real specimens vary. For more, see mindat.org.