General Information:
Chemical Formula:
Na2(Si,Al,Be)7(O,OH,F)14
Composition:
(Molecular Weight = 425.47 gm)
Sodium 10.81 % Na
Beryllium 1.48 % Be
Aluminum 13.32 % Al
Silicon 23.76 % Si
Hydrogen 0.76 % H
Oxygen 43.62 % O
Fluorine 6.25 % F
Empirical Formula:
Na2Si3.6Al2.1Be0.7O8.4(OH)3.2F1.4
Environment:
Cavities in alkali-pegmatite veins.
Locality:
Narsarsuk, Greenland.
Physical Properties:
Cleavage:
[???] Good, [???] Good
Color:
colorless or white.
Density:
2.57
Diaphaniety:
Transparent
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Pseudo Hexagonal - Crystals show a hexagonal outline.,
Hardness:
6 - Orthoclase
Luster:
Vitreous (Glassy)
Streak:
white
More details...