Halurgite

General Information:
 Chemical Formula:
Mg2[B4O5(OH)4]2·(H2O)
 Composition:
(Molecular Weight = 449.16 gm)
Magnesium 10.82 % Mg
Boron 19.25 % B 
Hydrogen 2.24 % H 
Oxygen 67.68 % O 
 Empirical Formula:
Mg22(B4)2(O5)2(OH)4·(H2O)
 IMA Status:
Approved IMA 1962
Physical Properties:
 Color:
white.
 Density:
2.19
 Hardness:
2.5-3 - Finger Nail-Calcite
 Streak:
white
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