Hannayite

General Information:
 Chemical Formula:
(NH4)2Mg3H4(PO4)4·8(H2O)
 Composition:
(Molecular Weight = 637.03 gm)
Magnesium 11.45 % Mg
Phosphorus 19.45 % P 
Hydrogen 4.43 % H 
Nitrogen 4.40 % N 
Oxygen 60.28 % O 
 Empirical Formula:
(NH4)2Mg3H4(PO4)4·8(H2O)
Physical Properties:
 Cleavage:
[001] Perfect, [110] Indistinct, [110] Indistinct
 Color:
yellow.
 Density:
2.03
 Diaphaniety:
Transparent
 Hardness:
2-3 - Gypsum-Calcite
 Luster:
Vitreous (Glassy)
 Streak:
white
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