Musgravite

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

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.

References

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

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[Gemdat-1] 1.0 ^1.1 Gemdat

[Mindat-2] 2.0 ^2.1 ^2.2 ^2.3 Magnesiotaaffeite-6N’3S on Mindat

[1]

[2]

Musgravite

Topic: Chemistry

See also

References