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Minerals - Bismutotantalite | TerraCollect

Mineral - Bismutotantalite

BismutotantaliteBi(Ta,Nb)O₄

Chemical Properties

Mineral Class

Oxides and Hydrxides

Toxicity

none

Formula

Bi(Ta,Nb)O₄

Unit Cell

a=4,98 b=11,85 c=5,68 Z=4

Physical Properties

Hardness

5 - 5.5

Streak

brownyellowyellow brown

Optical Properties

Color

blackbrowngray

Birefringence

0,038

Luster

Metallic,

Adamantine

Transparency

opaque

Pleochroism

Geomineralogical Properties

Crystal System

orthorhombic

Composition

Elements

Mass

Nb₂O₅

6,63

Ta₂O₅

40,12

Fe₂O₃

0,11

Bi₂O₃

52,26

Sb₂O₃

0,04

ZnO

0,33

MnO

0,12

Uganda

Density

Very Heavy (>6)

Cleavage

Auf (010) gut, auf (101), (100), deutlich

Fracture

conchoidal,

uneven

Tenacity

Point Group

Space Group

Habit

coarse, massive, prismatic, tabular

Formation

Magmatic, in granitic pegmatites

Paragenesis

Twinning

Rarity

Very rare

Synonyms

Bismutotantalite

Groups and Members

Stibiotantalit-Gruppe