General Information:
Chemical Formula:
Na3Ce2(CO3)4F
Composition:
(Molecular Weight = 608.23 gm)
Sodium 11.34 % Na
Cerium 46.07 % Ce
Carbon 7.90 % C
Oxygen 31.57 % O
Fluorine 3.12 % F
Empirical Formula:
Na3Ce2(CO3)4F
Environment:
In a large pegmatite dike in nepheline syenite.
IMA Status:
Approved IMA 1996
Locality:
Poudrette Quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada.
Name Origin:
For Prof. Luke L. Y. Chang (1934-) University of Maryland, for his contributions to the study of carbonate group minerals.
Physical Properties:
Cleavage:
[001] Perfect
Color:
colorless or beige tan.
Density:
3.97
Diaphaniety:
Transparent to translucent
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Tabular - Form dimensions are thin in one direction.,
Hardness:
4.5 - Between Fluorite and Apatite
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Pearly
Streak:
white
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