Chalcophanite
Mineral ZnMn3O7·3H2O
About it
Bright, bluish-black platy crystals in drusy crusts and rosettes, from oxidized zinc and manganese ores. First described from Sterling Hill, New Jersey; fine examples also come from Broken Hill, Australia.
- Type
- Mineral
- Group
- Oxide (hydrated)
- Formula
- ZnMn3O7·3H2O
- Hardness (Mohs)
- 2.5
- Specific gravity
- 3.8–4
- Streak
- brown
- Lustre
- metallic, submetallic
- Crystal system
- Triclinic
- Colours
- bluish black, black, iridescent
- Transparency
- opaque
- Cleavage and fracture
- perfect basal
Typical values: real specimens vary. For more, see mindat.org.