gem identify

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Taaffeite-Zn

Refractive Index low
ne 1,724 - 1,730
Refractive Index high
no 1,729 - 1,735
Birefringence
0.004 - 0.006
Density
3.69 - 3.78
Polariscope
1 negative
Colours:
colourless, grey, blue, pink, red, violet, purple
Transparency:
Transparent
UVL:
distinct green
UVS:
distinct green
Remarks:

inclusions: healing cracks, crystal inclusions

Hardness:
8 - 8
Formula:
(Be,Zn,Mg)FeAI408
System:
Hexagonal
Rare?
5