Gaidonnayite

General Information:
 Chemical Formula:
Na2ZrSi3O9·2(H2O)
 Composition:
(Molecular Weight = 401.49 gm)
Sodium 11.45 % Na
Zirconium 22.72 % Zr
Silicon 20.99 % Si
Hydrogen 1.00 % H 
Oxygen 43.84 % O 
 Empirical Formula:
Na2ZrSi3O9·2(H2O)
 IMA Status:
Approved IMA 1974
Physical Properties:
 Cleavage:
None
 Color:
colorless, white, or light lilac.
 Density:
2.67
 Diaphaniety:
Transparent
 Hardness:
5 - Apatite
 Luminescence:
Fluorescent.
 Streak:
white
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