General Information:
Chemical Formula:
Na3AlF6
Composition:
(Molecular Weight = 209.94 gm)
Sodium 32.85 % Na
Aluminum 12.85 % Al
Fluorine 54.30 % F
Empirical Formula:
Na3AlF6
Environment:
Large bed in a granitic vein in gray gneiss.
Locality:
Ivigtut and Arksukfiord, West Greenland.
Name Origin:
Named from the Greek, kryos "frost" and lithos "stone."
Physical Properties:
Cleavage:
None
Color:
brownish black, colorless, gray, white, or reddish brown.
Density:
2.95 - 3, Average = 2.97
Diaphaniety:
Transparent to translucent
Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Euhedral Crystals - Occurs as well-formed crystals showing good external form.,
Hardness:
2.5-3 - Finger Nail-Calcite
Luminescence:
None.
Luster:
Vitreous - Greasy
Streak:
white
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