Keldyshite

General Information:
 Chemical Formula:
Na2-xHxZrSi2O7·n(H2O)
 Composition:
(Molecular Weight = 330.41 gm)
Sodium 10.44 % Na
Zirconium 27.61 % Zr
Silicon 17.00 % Si
Hydrogen 1.37 % H 
Oxygen 43.58 % O 
 Empirical Formula:
Na1.5H0.5ZrSi2O7·2(H2O)
 IMA Status:
Approved IMA 1962
Physical Properties:
 Cleavage:
[???] Indistinct, [???] Indistinct
 Color:
white.
 Density:
3.3
 Diaphaniety:
Transparent to Translucent
 Hardness:
3.5-4.5
 Luster:
Vitreous - Greasy
 Streak:
white
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