General Information:
Chemical Formula:
(K,Cs)Al4Be4(B,Be)12O28
Composition:
(Molecular Weight = 778.83 gm)
Cesium 4.27 % Cs
Potassium 3.77 % K
Beryllium 8.10 % Be
Aluminum 13.86 % Al
Boron 12.49 % B
Oxygen 57.52 % O
Empirical Formula:
K0.75Cs0.25Al4Be412(B0.75)12(Be0.25)O28
IMA Status:
Approved IMA 1965
Physical Properties:
Cleavage:
[???] Indistinct
Color:
colorless, grayish, yellow, yellowish white, or white.
Density:
3.44
Diaphaniety:
Transparent to Translucent
Hardness:
8.5 - Chrysoberyl
Luster:
Vitreous - Adamantine
Streak:
white
More details...