Hydroboracite
Mineral CaMgB6O8(OH)6·3H2O
About it
White radiating needles and fibrous masses of calcium magnesium borate in borate deposits. Known from Death Valley, California, from Turkey, and from the Inder deposit in Kazakhstan.
- Type
- Mineral
- Group
- Borate
- Formula
- CaMgB6O8(OH)6·3H2O
- Hardness (Mohs)
- 2
- Specific gravity
- 2.17
- Streak
- white
- Lustre
- vitreous (glassy), silky
- Crystal system
- Monoclinic
- Colours
- colourless, white
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.