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Minerals - Columbite-(Mn) | TerraCollect

Mineral - Columbite-(Mn)

Columbite-(Mn)Mn²⁺Nb₂O₆

Chemical Properties

Mineral Class

Oxides and Hydrxides

Toxicity

none

Formula

Mn²⁺Nb₂O₆

Unit Cell

a=14,43 b=5,76 c=5,08 Z=4

Physical Properties

Hardness

6

Streak

blackred

Density

Optical Properties

Color

blackbrown

Birefringence

Luster

Vitreous,

Metallic

Transparency

translucent,

opaque

Pleochroism

Geomineralogical Properties

Crystal System

orthorhombic

Composition

Elements

Mass

Nb₂O₅

68,10

Ta₂O₅

9,87

TiO₂

0,54

SnO₂

0,89

FeO

5,46

MnO

14,80

Na₂O

0,02

South Dakota (Palache et al. 1952)

Very Heavy (>6)

Cleavage

Deutlich auf (100), weniger deutlich auf (010)

Fracture

conchoidal,

uneven

Tenacity

Brittle

Point Group

Space Group

Habit

prismatic, tabular

Formation

In granitischen Pegmatiten

Paragenesis

Twinning

Kontaktzwillinge auf (021) und (023), pseudohexagonale Rotationszwillinge

Rarity

Rather rare

Synonyms

Columbite-(Mn), Columbite

Groups and Members

Columbit-Supergruppe

Columbit-Gruppe