General Information:
Chemical Formula:
NaY(CO3)F2
Composition:
(Molecular Weight = 209.90 gm)
Sodium 10.95 % Na
Yttrium 42.36 % Y
Carbon 5.72 % C
Oxygen 22.87 % O
Fluorine 18.10 % F
Empirical Formula:
NaY(CO3)F2
Environment:
In a large pegmatite dike.
IMA Status:
Approved IMA 1996
Locality:
Poudrette Quarry, Mont Saint-Hilare, Rouville County, Quebec, Canada.
Name Origin:
For Elsa (1947-) and Laszlo (1937-) Horvath, husband-and-wife team dedicated to the collection, study, and documantation of the minerals from Mont Saint-Hilaire.
Physical Properties:
Cleavage:
[100] Very Good, [010] Good
Color:
colorless, pale yellow, or pale beige.
Density:
3.58
Diaphaniety:
Transparent to translucent
Habits:
Tabular - Form dimensions are thin in one direction., ,
Hardness:
4 - Fluorite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
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