Johannsenite
Mineral CaMnSi2O6
About it
Manganese pyroxene in clove-brown to grey-green radiating sprays and prisms in skarns around ore deposits; named for petrologist Albert Johannsen.
- Type
- Mineral
- Group
- Silicate (inosilicate), pyroxene group
- Formula
- CaMnSi2O6
- Hardness (Mohs)
- 6
- Specific gravity
- 3.27–3.54
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Monoclinic
- Colours
- clove brown, grey, greenish, bluish, colourless
- Transparency
- transparent, translucent, opaque
- Cleavage and fracture
- good in two directions at nearly 90°
Typical values: real specimens vary. For more, see mindat.org.