General Information:
Chemical Formula:
NaCaY(F,Cl)6
Composition:
(Molecular Weight = 450.18 gm)
Sodium 5.11 % Na
Calcium 8.90 % Ca
Yttrium 19.75 % Y
Chlorine 47.25 % Cl
Fluorine 18.99 % F
Empirical Formula:
NaCaYF4.5Cl6
IMA Status:
Approved IMA 1987
Physical Properties:
Cleavage:
[???] Good
Color:
yellow, cream white, light brown, or pink.
Density:
4.21
Diaphaniety:
Transparent
Hardness:
4.5 - Between Fluorite and Apatite
Luster:
Vitreous - Dull
Streak:
white
More details...