General Information:
Chemical Formula:
(Ce,La)F3
Composition:
(Molecular Weight = 196.99 gm)
Lanthanum 7.05 % La
Cerium 64.02 % Ce
Fluorine 28.93 % F
Empirical Formula:
Ce0.9La0.1F3
Environment:
Granitic rocks.
IMA Status:
Approved IMA 1987
Locality:
Falun and Osterby, Sweden.
Name Origin:
Named after its chemical composition containing fluorine (Latin, fluere = "to flow") and cerium (Named after the asteroid Ceres).
Physical Properties:
Cleavage:
[001] Perfect
Color:
pale wax yellow, yellowish brown, or reddish brown.
Density:
6.13
Diaphaniety:
Transparent to translucent
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).,
Hardness:
4.5-5
Luminescence:
Non-fluorescent.
Luster:
Waxy
Streak:
yellow white
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