Eakerite

General Information:
 Chemical Formula:
Ca2SnAl2Si6O18(OH)2·2(H2O)
 Composition:
(Molecular Weight = 779.38 gm)
Calcium 10.28 % Ca
Aluminum 6.92 % Al
Silicon 21.62 % Si
Tin 15.23 % Sn
Hydrogen 0.78 % H 
Oxygen 45.16 % O 
 Empirical Formula:
Ca2SnAl2Si6O18(OH)2·2(H2O)
 IMA Status:
Approved IMA 1970
 Name Origin:
Name after Easton, Pennsylvania, USA.
Physical Properties:
 Cleavage:
None
 Color:
colorless or white.
 Density:
2.93
 Diaphaniety:
Transparent
 Hardness:
5.5 - Knife Blade
 Luster:
Vitreous (Glassy)
 Streak:
white
More details...