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Minerals - Steenstrupine-(Ce) | TerraCollect
Mineral - Steenstrupine-(Ce)
Steenstrupine-(Ce)
Na₁₄Ce₆Mn²⁺(Mn³⁺Fe³⁺)₂(Zr,Th)(Si₆O₁₈)₂(PO₄)₇(OH)₂·3H₂O
Chemical Properties
Mineral Class
Silicates
Toxicity
radioactive
Formula
Na₁₄Ce₆Mn²⁺(Mn³⁺Fe³⁺)₂(Zr,Th)(Si₆O₁₈)₂(PO₄)₇(OH)₂·3H₂O
Unit Cell
a=10,46 c=45,48 Z=3
Physical Properties
Hardness
4 - 5
Streak
white
brown
brown white
Optical Properties
Color
black
brown
Birefringence
0.004
Luster
Vitreous,
Greasy
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
trigonal
Composition
Elements
Mass
SiO₂
26,72
ZrO₂
3,92
ThO₂
2,13
Y₂O₃
0,36
(Ce,La)₂O₃
29,60
Fe₂O₃
2,67
Mn₂O₃
2,51
Density
Cleavage
nd
Fracture
conchoidal
Tenacity
nd
Point Group
Space Group
Habit
coarse,
dipyramidal,
massive,
Rhombohedron,
tabular
Formation
Magmatisch, in Pegmatiten von Nephelin-Syeniten
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Steenstrupine-(Ce)
Nb₂O₅
4,37
MnO
6,60
MgO
0,31
CaO
2,33
Na₂O
11,23
H₂O
3,45
P₂O₅
8,19
F
1,23
Grönland
Groups and Members
Steenstrupin-Gruppe
