Heidornite

General Information:
 Chemical Formula:
Na2Ca3B5O8(SO4)2Cl(OH)2
 Composition:
(Molecular Weight = 609.85 gm)
Sodium 7.54 % Na
Calcium 19.72 % Ca
Boron 8.86 % B 
Hydrogen 0.33 % H 
Sulfur 10.52 % S 
Chlorine 5.81 % Cl
Oxygen 47.22 % O 
 Empirical Formula:
Na2Ca3B5O8(SO4)2Cl(OH)2
Physical Properties:
 Cleavage:
[001] Perfect
 Color:
colorless.
 Density:
2.753
 Diaphaniety:
Transparent
 Hardness:
4-5 - Fluorite-Apatite
 Luster:
Vitreous (Glassy)
 Streak:
white
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