Manganite
Mineral MnO(OH)
About it
Striated black prisms in bundles and sprays, with a reddish-brown to black streak that sets it apart from pyrolusite. Classic crystals come from Ilfeld in Germany's Harz Mountains.
- Type
- Mineral
- Group
- Hydroxide
- Formula
- MnO(OH)
- Hardness (Mohs)
- 4
- Specific gravity
- 4.29–4.34
- Streak
- reddish brown to black
- Lustre
- submetallic, metallic
- Crystal system
- Monoclinic
- Colours
- steel grey, black
- Transparency
- opaque
- Cleavage and fracture
- perfect in one direction; uneven fracture
Typical values: real specimens vary. For more, see mindat.org.