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Minerals - Tapiolite-(Fe) | TerraCollect

Mineral - Tapiolite-(Fe)

Tapiolite-(Fe)Fe²⁺Ta₂O₆

Chemical Properties

Mineral Class

Oxides and Hydrxides

Toxicity

none

Formula

Fe²⁺Ta₂O₆

Unit Cell

a=4.75 c=9.21 Z=2

Physical Properties

Hardness

6 - 6.5

Streak

brown

Density

Very Heavy (>6)

Optical Properties

Color

blackbrown

Birefringence

0.150

Luster

Metallic,

Adamantine

Transparency

opaque

Pleochroism

Geomineralogical Properties

Crystal System

tetragonal

Composition

Elements

Mass

Nb₂O₅

1.32

Ta₂O₅

85.21

TiO₂

0.46

SnO₂

0.02

FeO

9.67

MnO

4.17

Finland (Palache et al. 1952)

Groups and Members

Tapiolite-Group

Karten-Ebenen

Geologische KarteSatelliten Karte

Cleavage

Fracture

Tenacity

Brittle

Point Group

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

Space Group

P42/mnm (136)

Habit

dipyramidal, prismatic, tabular

Formation

Primarily in highly fractionated, REE-rich granitic pegmatites (especially of the LCT type)

Paragenesis

Twinning

Rarity

Rarely

Synonyms

Tapiolite-(Fe)