Natrotantite

General Information:
 Chemical Formula:
Na2Ta4O11
 Composition:
(Molecular Weight = 945.76 gm)
Sodium 4.86 % Na
Tantalum 76.53 % Ta
Oxygen 18.61 % O 
 Empirical Formula:
Na2Ta4O11
 IMA Status:
Approved IMA 1981
Physical Properties:
 Cleavage:
None
 Color:
colorless.
 Density:
7.705
 Diaphaniety:
Transparent
 Hardness:
7 - Quartz
 Luster:
Adamantine
 Streak:
white
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