Leakeite

General Information:
 Chemical Formula:
NaNa2(Mg2Fe+++2Li)Si8O22(OH)2
 Composition:
(Molecular Weight = 846.90 gm)
Sodium 8.14 % Na
Lithium 0.82 % Li
Magnesium 5.74 % Mg
Iron 13.19 % Fe
Silicon 26.53 % Si
Hydrogen 0.24 % H 
Oxygen 45.34 % O 
 Empirical Formula:
Na3Mg2Fe3+2Li(Si8O22)(OH)2
 IMA Status:
Approved IMA
Physical Properties:
 Cleavage:
[???] Perfect
 Color:
dark red.
 Density:
3.11
 Diaphaniety:
Translucent
 Hardness:
6 - Orthoclase
 Luster:
Vitreous (Glassy)
 Streak:
light red
More details...