Taaffeite

General Information:
 Chemical Formula:
Mg3Al8BeO16
 Composition:
(Molecular Weight = 553.77 gm)
Magnesium 13.17 % Mg
Beryllium 1.63 % Be
Aluminum 38.98 % Al
Oxygen 46.23 % O 
 Empirical Formula:
Mg3Al8BeO16
 IMA Status:
Accepted IMA 1982
Physical Properties:
 Cleavage:
None
 Color:
colorless, violet red, greenish, light green, or pink violet.
 Density:
3.6 - 3.613, Average = 3.6
 Diaphaniety:
Transparent to Translucent
 Hardness:
8-8.5
 Luster:
Vitreous (Glassy)
 Streak:
white
More details...