General Information:
Chemical Formula:
NaCa2(Zr,Nb)Si2O7(O,OH,F)2
Physical Properties:
Cleavage:
[???] Perfect
Color:
yellow, dark yellow, gray, or brown.
Density:
3.42
Diaphaniety:
Transparent to Translucent
Hardness:
5.5-6 - Knife Blade-Orthoclase
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Greasy
More details...