gem identify

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Baryte

Refractive Index nx
1,632 - 1,637
Refractive Index ny
1,637 - 1,637
Refractive Index nz
1,648 - 1,650
Birefringence
0.010 - 0.018
Density
4.30 - 4.60
Polariscope
2 positive
Colours:
colourless, white, yellow, brown, red, green, black
Transparency:
Transparent, Translucent, Opaque
Pleochroism:
weak brown: straw yellow/ wine yellow/violet; yellow: pale yellow/ yellow-brown; green: colorless/pale green/violet
UVL:
white-green, white-pinkish, creme
UVS:
white, blue-green, gray, yellowish
Remarks:

cleavage often detectable

Hardness:
3 - 3,5
Formula:
BaSO4
System:
Orthorhombic
Rare?
3