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Minerals - Tantalite-(Mn) | TerraCollect
Mineral - Tantalite-(Mn)
Tantalite-(Mn)
Mn²⁺Ta₂O₆
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
Mn²⁺Ta₂O₆
Unit Cell
a=14.44 b=5.77 c=5.09 Z=4
Physical Properties
Hardness
6
Streak
black
red
Density
Optical Properties
Color
black
brown
red
Birefringence
0.200
Luster
Vitreous,
Metallic
Transparency
translucent,
opaque
Pleochroism
Rot-Braun-Orange
Geomineralogical Properties
Crystal System
Composition
Elements
Mass
Nb₂O₅
0.29
Ta₂O₅
85.80
SnO₂
0.03
FeO
0.04
MnO
13.88
CaO
0.17
Mosambik (Sahama 1980)
Groups and Members
Columbite-Supergroup
Columbite-Group
Karten-Ebenen
Geologische Karte
Satelliten Karte
Very Heavy (>6)
Cleavage
Distinct after {100}, indistinct after {010}
Fracture
conchoidal,
uneven
Tenacity
Brittle
orthorhombic
Point Group
orthorhombic-dipyramidal - 2/m 2/m 2/m
Space Group
Pbcn (60)
Habit
blocky,
lath-shaped,
prismatic,
tabular
Formation
Primarily magmatic, formed by fractional crystallization in highly developed, REE-rich LCT-type (lithium-cesium-tantalum) granitic pegmatites
Paragenesis
Twinning
Contact twins after {021} and {023}, pseudohexagonal rotational twins
Rarity
Rather rare
Synonyms
Tantalite-(Mn)
