Mineral - Fluocerite-(Ce)
Fluocerite-(Ce)
Chemical Properties
Mineral Class
Halides
Toxicity
none
Formula
(Ce,La)F₃
Unit Cell
a=7,19 c=7,35 Z=6
Physical Properties
Hardness
4.5 - 5
Streak
white
Density
Very Heavy (>6)
Cleavage
unvollkommen
Fracture
conchoidal
Tenacity
Brittle
Optical Properties
Color
browngrayorangeyellow
Birefringence
0,006
Luster
Vitreous,
Greasy
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
trigonal
Point Group
Space Group
Habit
blocky, coarse, massive, prismatic, tabular
Formation
Magmatisch, in Graniten
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Fluocerite-(Ce)
Composition
Elements
Mass
ThO₂
1,56
(Y,Tb,Dy)₂O₃
0,08
Ce₂O₃
42,34
La₂O₃
33,13
Pr₂O₃
3,68
Nd₂O₃
3,12
Sm₂O₃
0,17
Gd₂O₃
0,08
Fe₂O₃
0,14
MgO
0,01
CaO
0,53
F
36,13
Kasachstan
Groups and Members
Fluocerit-Gruppe