Taaffeite

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Taaffeite
Chemical composition Magnesium-beryllium-aluminium oxide

Mg3BeAl8O16

Crystal system Hexagonal
Hardness 8
Luster Vitreous
Optic nature Uniaxial -
Refractive index 1.717 - 1.724
Birefringence 0.004 - 0.005
Dispersion 0.019
Specific gravity 3.60 - 3.62
Pleochroism Faint
Fluorescence

LW: inert to lightgreen
SW: inert