Mineral - Stibiotantalite
Stibiotantalite
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
Sb(Ta,Nb)O₄
Unit Cell
a=4,91 b=11,81 c=5,54 Z=4
Physical Properties
Hardness
5.5
Streak
brownyellowyellow brown
Density
Very Heavy (>6)
Cleavage
Deutlich auf (001), undeutlich auf (100)
Fracture
conchoidal,
uneven
Tenacity
Brittle
Optical Properties
Color
brownorangeyellow
Birefringence
0,083
Luster
Adamantine,
Resinous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
Space Group
Habit
blocky, prismatic, tabular
Formation
Magmatisch, Granit-Pegmatite
Paragenesis
Twinning
Kontaktzwillingen nach (010)
Rarity
Rarely
Synonyms
Stibiotantalite
Composition
Elements
Mass
Nb₂O₅
11,30
Ta₂O₅
43,30
SiO₂
0,10
Sb₂O₃
40,30
Bi₂O₃
3,80
CaO
0,10
Kalifornien
Groups and Members
Cervantit-Gruppe