Aluminobarroisite

General Information:
 Chemical Formula:
[ ]CaNaMg3Al2(Si7Al)O22(OH)2
 Composition:
(Molecular Weight = 799.53 gm)
Sodium 2.88 % Na
Calcium 5.01 % Ca
Magnesium 9.12 % Mg
Aluminum 10.12 % Al
Silicon 24.59 % Si
Hydrogen 0.25 % H 
Oxygen 48.03 % O 
 Empirical Formula:
CaNaMg3Al2(Si7AlO22)(OH)2
 IMA Status:
Approved IMA 1978
Physical Properties:
 Density:
2.94
 Diaphaniety:
Transparent to Translucent
 Hardness:
5-6 - Between Apatite and Orthoclase
 Luster:
Vitreous (Glassy)
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