Hambergite
Mineral Be2(BO3)(OH)
About it
Colourless, glassy, wedge-shaped prisms from granite pegmatites, very light for so hard a mineral. Fine crystals come from Madagascar, Pakistan, and Afghanistan.
- Type
- Mineral
- Group
- Borate
- Formula
- Be2(BO3)(OH)
- Hardness (Mohs)
- 7.5
- Specific gravity
- 2.35–2.37
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Orthorhombic
- Colours
- colourless, white, greyish white, yellowish
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.