Bahianite

General Information:
 Chemical Formula:
Al5Sb+++++3O14(OH)2
 Composition:
(Molecular Weight = 758.16 gm)
Aluminum 17.79 % Al
Antimony 48.18 % Sb
Hydrogen 0.27 % H 
Oxygen 33.76 % O 
 Empirical Formula:
Al5Sb3O14(OH)2
 IMA Status:
Approved IMA 1974
Physical Properties:
 Cleavage:
[100] Perfect
 Color:
colorless, violet, cream white, or light brown.
 Density:
4.89 - 5.46, Average = 5.17
 Diaphaniety:
Transparent
 Hardness:
9 - Corundum
 Luster:
Adamantine
 Streak:
white
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