Villiaumite
Refractive Index
1.326 - 1.332
Density
2.78 - 2.81
Polariscope
iso
Colours:
colourless, pink, red, orange
Transparency:
Transparent, Translucent
Pleochroism:
anomalous: strong: yellow/pink to deep carmine red
UVS:
may Florence weak red
Remarks:
soluble in hot water; sometimes anomalous anisotropism
Hardness:
2 - 2,5
Formula:
NaF
System:
Cubic
Rare?
5