Mineral - Gadolinite-(Y)
Gadolinite-(Y)
Chemical Properties
Mineral Class
Silicates
Toxicity
radioactive
Formula
Y₂Fe²⁺Be₂Si₂O₁₀
Unit Cell
a=10,00 b=7,57 c=4,77 β=91° Z=2
Physical Properties
Hardness
6.5 - 7
Streak
white
Density
Cleavage
Fracture
conchoidal,
splintery
Tenacity
Brittle
Optical Properties
Color
blackbrown
Birefringence
0,050
Luster
Vitreous,
Greasy
Transparency
translucent,
opaque
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
Space Group
Habit
blocky, massive, prismatic
Formation
In granitischen Pegmatiten
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Gadolinite-(Y)
Composition
Elements
Mass
SiO₂
22,13
ThO₂
0,89
Y₂O₃
22,24
(Dy,La)₂O₃
21,23
Ce₂O₃
11,10
Fe₂O₃
3,47
FeO
10,43
BeO
7,19
CaO
0,48
Na₂O
0,46
H₂O
0,86
Colorado
Groups and Members
Gadolinit-Supergruppe
Gadolinit-Gruppe
Gadolinit-Subgruppe