General Information:
Chemical Formula:
(Na,Ca)2BeSi2(O,OH,F)7
Composition:
(Molecular Weight = 235.92 gm)
Sodium 14.62 % Na
Calcium 8.49 % Ca
Beryllium 3.82 % Be
Silicon 23.81 % Si
Hydrogen 0.90 % H
Oxygen 42.72 % O
Fluorine 5.64 % F
Empirical Formula:
Na1.5Ca0.5BeSi2O4.2(OH)2.1F0.7
Locality:
Langesundfiord district, southern Norway.
Physical Properties:
Cleavage:
[???] Good, [???] Good, [???] Distinct
Color:
white, greenish yellow, yellow, or light green.
Density:
2.96
Diaphaniety:
Transparent to translucent
Habits:
Tabular - Form dimensions are thin in one direction., ,
Hardness:
4 - Fluorite
Luminescence:
Fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
More details...