Garyansellite

General Information:
 Chemical Formula:
(Mg,Fe+++)3(PO4)2(OH,O)·1,5(H2O)
 Composition:
(Molecular Weight = 330.29 gm)
Magnesium 16.56 % Mg
Iron 12.68 % Fe
Phosphorus 18.76 % P 
Hydrogen 1.14 % H 
Oxygen 50.86 % O 
 Empirical Formula:
3(Mg0.75)3(Fe3+0.25)(PO4)2(OH)0.75O0.25·1.5(H2O)
 IMA Status:
Approved IMA
Physical Properties:
 Cleavage:
[001] Good
 Color:
brown.
 Density:
3.16
 Diaphaniety:
Translucent
 Hardness:
4 - Fluorite
 Luster:
Vitreous (Glassy)
 Streak:
brown
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