Musgravite

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Musgravite
Chemical composition Magnesium-beryllium-aluminium oxide

Mg2BeAl6O12

Crystal system Trigonal
Hardness 8
Optic nature uniaxial -
Refractive index 1.721 - 1.728
Birefringence ± 0.004
Specific gravity ± 3.69
Pleochroism faint
Fluorescence

LW: inert
SW: inert

Musgravite is a polytype of taaffeite and is known amongst mineralogists as "magnesiotaaffeite-6N'3S".
The, gemological, name is derived from the Musgrave Ranges in central Australia.

Prior to 2002 this mineral was named "musgravite" by mineralogists aswell as gemologists. We gemologists still use the name "musgravite".

Sources