Mineral - Hydropyrochlore
Hydropyrochlore
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
(H₂O, □)₂Nb₂(O,OH)₆(H₂O)
Unit Cell
a=10,60 Z=8
Physical Properties
Hardness
4 - 4.5
Streak
whitegray
Density
Normal (2-3,5)
Cleavage
Fracture
uneven
Tenacity
Optical Properties
Color
whitegraygreengreen whitegreen grey
Birefringence
Luster
Vitreous,
Greasy
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
isometric
Point Group
Space Group
Habit
Octahedron
Formation
Als alluviale Lagerstätte aus einem magmatischen Carbonatit-Pluton entstanden
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Hydropyrochlore
Composition
Elements
Mass
U₃O₈
0,11
Nb₂O₅
78,60
Ta₂O₅
0,06
V₂O₅
0,02
TiO₂
4,12
ZrO₂
0,65
SnO₂
0,01
ThO₂
0,12
Al₂O₃
0,18
RE₂O₃
0,44
Fe₂O₃
0,21
FeO
0,06
PbO
0,01
MgO
0,10
MnO
0,08
CaO
0,40
BaO
0,28
SrO
2,60
Na₂O
0,36
K₂O
2,72
F
0,38
H₂O
8,50
DR Kongo
Groups and Members
Pyrochlor-Supergruppe
Pyrochlor-Gruppe