Cryolite
Refractive Index nx
1,338 - 1,339
Refractive Index ny
1,338 - 1,339
Refractive Index nz
1,339 - 1,340
Birefringence
0.001 - 0.001
Density
2.95 - 2.97
Polariscope
2 positive
Colours:
colourless
Transparency:
Transparent
Remarks:
no remarks
Hardness:
2,5 - 2,5
Formula:
Na3AIF6
System:
Monoclinic
Rare?
5