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General Information:
 Chemical Formula:
Na2Si2O5·5(H2O)
 Composition:
(Molecular Weight = 272.22 gm)
Sodium 16.89 % Na
Silicon 20.63 % Si
Hydrogen 3.70 % H 
Oxygen 58.77 % O 
 Empirical Formula:
Na2(Si2O5)·5(H2O)
 IMA Status:
Approved IMA 1980
Physical Properties:
 Cleavage:
[100] Perfect, [010] Perfect
 Color:
colorless or white.
 Density:
1.94
 Diaphaniety:
Transparent
 Hardness:
2 - Gypsum
 Luster:
Vitreous - Pearly
 Streak:
white
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