General Information:
Chemical Formula:
Ca2(Mg,Al)6(Si,Al,B)6O20
Composition:
(Molecular Weight = 706.15 gm)
Calcium 11.35 % Ca
Magnesium 15.49 % Mg
Aluminum 12.61 % Al
Silicon 14.32 % Si
Boron 0.92 % B
Oxygen 45.31 % O
Empirical Formula:
Ca2Mg4.5Al1.5Si3.6Al1.8B0.6O20
Locality:
Gangapitiya near Ambakotte, Ceylon.
Physical Properties:
Cleavage:
None
Color:
blue, blue green, gray blue, light yellow, or dark blue.
Density:
3.4
Diaphaniety:
Transparent to translucent
Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., Twinning Common - Crystals are usually twinned.,
Hardness:
6-7 - Orthoclase-Quartz
Luster:
Vitreous (Glassy)
Streak:
white
More details...