Musgravite
(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 Luster 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
- ^ a b Gemdat
- ^ a b c d Magnesiotaaffeite-6N’3S on Mindat
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