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Musgravite or magnesiotaaffeite-6N’3S (chemical formula of Be(Mg, Fe, Zn)2Al6O12), 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.[2] It is a member of the taaffeite family of minerals.[2][1] Its hardness is 8 to 8.5 on the Mohs scale.[2]

Musgravite
Musgravit-G-EmpireTheWorldOfGems.jpg
Musgravite from Sri Lanka
General
CategoryOxide minerals
Formula
(repeating unit)
(Mg,Fe,Zn)2BeAl6O12
Strunz classification04.FC.25
Crystal systemTrigonal
Identification
ColorGrey green to green
FractureConchoidal
Mohs scale hardness8–8.5
LusterVitreous
DiaphaneityTransparent
Specific gravity3.62–3.68
Optical propertiesUniaxial
Refractive indexnω = 1.739, nε = 1.735
Birefringenceδ = 0.014 to 0.016
References[1][2]

ReferencesEdit