Ameghinite

Ameghinite (Na[H4B3O7]) is a mineral found in Argentina.
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General Information:
 Chemical Formula:
NaB3O3(OH)4
 Composition:
(Molecular Weight = 171.45 gm)
Sodium 13.41 % Na
Boron 18.92 % B 
Hydrogen 2.35 % H 
Oxygen 65.32 % O 
 Empirical Formula:
NaB3O3(OH)4
 IMA Status:
Approved IMA 1967
Physical Properties:
 Cleavage:
[???] Distinct, [???] Imperfect
 Color:
colorless.
 Density:
2.02 - 2.03, Average = 2.02
 Diaphaniety:
Transparent
 Hardness:
2-3 - Gypsum-Calcite
 Luminescence:
Fluorescent phosphorescent.
 Luster:
Vitreous (Glassy)
 Streak:
white
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