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Minerals - Béhierite | TerraCollect

Mineral - Béhierite

Béhierite(Ta,Nb)(BO₄)

Chemical Properties

Mineral Class

Borates

Toxicity

none

Formula

(Ta,Nb)(BO₄)

Unit Cell

a=6.21 c=5.47 Z=4

Physical Properties

Hardness

7 - 7.5

Streak

white

Density

Very Heavy (>6)

Optical Properties

Color

whiteblackgraypink

Birefringence

Luster

Adamantine

Transparency

translucent,

opaque

Pleochroism

Geomineralogical Properties

Crystal System

Composition

Elements

Mass

B₂O₃

[15.77]

Nb₂O₅

21.73

Ta₂O₅

63.95

Madagascar (Mrose et al. 1961)

Karten-Ebenen

Geologische KarteSatelliten Karte

Cleavage

Distinct after {110} and {010}

Fracture

conchoidal

Tenacity

tetragonal

Point Group

ditetragonal-dipyramidal - 4/m 2/m 2/m

Space Group

I41/amd (141)

Habit

dipyramidal, pyramidal, tabular

Formation

In magmatic REE-pegmatites

Paragenesis

Twinning

Rarity

Very rare

Synonyms

Béhierite, Behierite