Musgravite

Musgravite from Sri Lanka

General
Category| Oxide minerals
Formula
(repeating unit)| (Mg,Fe,Zn)2BeAl6O12
Strunz classification| 04.FC.25
Crystal system| Trigonal
Identification
Color| Grey green to green
Fracture| Conchoidal
Mohs scale hardness| 8–8.5
|re|er}}| Vitreous
Diaphaneity| Transparent
Specific gravity| 3.62–3.68
Optical properties| Uniaxial
Refractive index| nω = 1.739, nε = 1.735
Birefringence| δ = 0.014 to 0.016
References| [1][2]

Musgravite or magnesiotaaffeite-6N’3S is a rare oxide mineral used as a gemstone. Its type locality is the Ernabella Mission, Musgrave Ranges, South Australia, for which it was named following its discovery in 1967.[2] It is a member of the taaffeite family of minerals,[2][1] and its chemical formula is Be(Mg, Fe, Zn)2Al6O12. Its hardness is 8 to 8.5 on the Mohs scale.[2] Due to its rarity, the mineral can sell for roughly USD$35,000 per carat.

## See also

* List of minerals

## References

1. ↑ 1.0 1.1 Gemdat
2. ↑ 2.0 2.1 2.2 2.3 Magnesiotaaffeite-6N’3S on Mindat

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