Mineral - Fluorcalciomicrolite
Fluorcalciomicrolite
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
(Ca,Na)₂(Ta,Nb)₂O₆F
Unit Cell
a=10,42 Z=8
Physical Properties
Hardness
4 - 5
Streak
yellow
Density
Very Heavy (>6)
Cleavage
Fracture
conchoidal
Tenacity
Brittle
Optical Properties
Color
brownyellowgreen
Birefringence
Luster
Vitreous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
isometric
Point Group
Space Group
Habit
Octahedron
Formation
Magmatisch, granitische Pegmatit
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Fluorcalciomicrolite
Composition
Elements
Mass
Na₂O
4,68
CaO
11,24
MnO
0,01
SrO
0,04
BaO
0,02
SnO₂
0,63
UO₂
0,02
Nb₂O₅
3,47
Ta₂O₅
76,02
F
3,96
H₂O
0,48
Brasilien
Groups and Members
Pyrochlor-Supergruppe
Mikrolith-Gruppe