Barentsite

General Information:
 Chemical Formula:
Na7AlH2(CO3)4F4
 Composition:
(Molecular Weight = 505.96 gm)
Sodium 31.81 % Na
Aluminum 5.33 % Al
Hydrogen 0.40 % H 
Carbon 9.50 % C 
Oxygen 37.95 % O 
Fluorine 15.02 % F 
 Empirical Formula:
Na7AlH2(CO3)4F4
 Environment:
Drill core in pegmatitic rock.
 Locality:
Mt. Restinyon, Kola Peninsula, Russia.
 Name Origin:
Namde to honor Dutch sailor Willem Barents and the sea that washes the Kola Peninsula.
Physical Properties:
 Cleavage:
[001] Perfect, [100] Perfect
 Color:
colorless.
 Density:
2.56
 Diaphaniety:
Transparent
 Habits:
Anhedral Grains - Granular minerals without the expression of crystal shapes, ,
 Hardness:
3 - Calcite
 Luster:
Vitreous - Pearly
 Streak:
white
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