General Information:
Chemical Formula:
Na2SrBa2Al4F20
Composition:
(Molecular Weight = 896.15 gm)
Barium 30.65 % Ba
Sodium 5.13 % Na
Strontium 9.78 % Sr
Aluminum 12.04 % Al
Fluorine 42.40 % F
Empirical Formula:
Na2SrBa2Al4F20
IMA Status:
Approved IMA 1986
Locality:
Ivigtut, Greenland.
Name Origin:
Named for Richard Bogvad (1952-), Danish, former chief geologist of the cryolite mining company.
Physical Properties:
Color:
colorless.
Density:
3.85
Diaphaniety:
Transparent
Habits:
Blocky - Crystal shape tends to be equant (e.g. feldspars)., ,
Hardness:
4 - Fluorite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
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