Mineral - Stibiocolumbite
Stibiocolumbite
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
Sb(Nb,Ta)O₄
Unit Cell
a=4,93 b=11,80 c=5,56 Z=4
Physical Properties
Hardness
5.5
Streak
brownyellowyellow brown
Density
Cleavage
Deutlich auf (001), undeutlich auf (100)
Fracture
conchoidal,
uneven
Tenacity
Brittle
Optical Properties
Color
blackbrownorangeyellow
Birefringence
0,061
Luster
Adamantine,
Resinous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
Space Group
Habit
prismatic
Formation
Magmatisch, Granit-Pegmatite
Paragenesis
Twinning
Rarity
Very rare
Synonyms
Stibiocolumbite
Composition
Elements
Mass
Nb₂O₅
37,30
Ta₂O₅
13,00
TiO₂
0,01
SnO₂
0,01
Bi₂O₃
0,53
Sb₂O₃
49,28
Kalifornien
Groups and Members
Cervantit-Gruppe