Kurnakovite
Mineral MgB3O3(OH)5·5H2O
About it
Colourless, blocky crystals of magnesium borate, the triclinic partner of inderite with the same formula. Large crystals come from Boron, California; named for Russian chemist Nikolai Kurnakov.
- Type
- Mineral
- Group
- Borate
- Formula
- MgB3O3(OH)5·5H2O
- Hardness (Mohs)
- 2.5–3
- Specific gravity
- 1.83–1.86
- Streak
- white
- Lustre
- vitreous (glassy), pearly
- Crystal system
- Triclinic
- Colours
- colourless, white
- Transparency
- transparent, translucent
- Cleavage and fracture
- good in one direction
Typical values: real specimens vary. For more, see mindat.org.