Fluoborite
Mineral Mg3(BO3)(F,OH)3
About it
Colourless to white six-sided prisms and fibrous masses in magnesian skarns and marbles. First found at Norberg, Sweden; also known from Sterling Hill, New Jersey.
- Type
- Mineral
- Group
- Borate
- Formula
- Mg3(BO3)(F,OH)3
- Hardness (Mohs)
- 3.5
- Specific gravity
- 2.85–2.98
- Streak
- white
- Lustre
- vitreous (glassy), silky
- Crystal system
- Hexagonal
- Colours
- colourless, white, pale violet
- Transparency
- transparent, translucent
- Cleavage and fracture
- indistinct basal
- Under UV light
- sometimes cream under shortwave UV
Typical values: real specimens vary. For more, see mindat.org.