Wilhelmvierlingite

General Information:
 Chemical Formula:
CaMn++Fe+++(PO4)2(OH)·2(H2O)
 Composition:
(Molecular Weight = 393.84 gm)
Calcium 10.18 % Ca
Manganese 13.95 % Mn
Iron 14.18 % Fe
Phosphorus 15.73 % P 
Hydrogen 1.28 % H 
Oxygen 44.69 % O 
 Empirical Formula:
CaMn2+Fe3+(PO4)2(OH)·2(H2O)
 IMA Status:
Approved IMA
Physical Properties:
 Cleavage:
[010] Perfect
 Color:
brownish yellow or yellow.
 Density:
2.58
 Diaphaniety:
Transparent to Translucent
 Hardness:
4 - Fluorite
 Luster:
Vitreous (Glassy)
 Streak:
white
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