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Minerals - Stillwellite-(Ce) | TerraCollect
Mineral - Stillwellite-(Ce)
Stillwellite-(Ce)
(Ce,La,Ca)BSiOâ‚…
Chemical Properties
Mineral Class
Silicates
Toxicity
radioactive
Formula
(Ce,La,Ca)BSiOâ‚…
Unit Cell
a=6,84 c=6,70 Z=3
Physical Properties
Hardness
6.5
Streak
white
Density
Optical Properties
Color
brown
gray
orange
yellow
Birefringence
0,015
Luster
Vitreous,
Greasy
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
Composition
Elements
Mass
SiOâ‚‚
22,40
UOâ‚‚
0,01
ThOâ‚‚
0,03
B₂O₃
12,33
Al₂O₃
0,42
Y₂O₃
0,74
La₂O₃
27,95
Cleavage
Unvollkommen
Fracture
conchoidal
Tenacity
trigonal
Point Group
Space Group
Habit
Octahedron,
prismatic,
Rhombohedron,
tabular
Formation
In alkalischen Pegmatiten von Syeniten
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Stillwellite-(Ce)
Ce₂O₃
33,15
Pr₂O₃
0,01
Nd₂O₃
0,01
Sm₂O₃
0,01
Fe₂O₃
0,18
MgO
0,06
CaO
0,95
F
0,30
Hâ‚‚O
0,95
Pâ‚‚Oâ‚…
0,67
Australien
