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Minerals - Fluorcalciomicrolite | TerraCollect

Mineral - Fluorcalciomicrolite

Fluorcalciomicrolite(Ca,Na)₂(Ta,Nb)₂O₆F

Chemical Properties

Mineral Class

Oxides and Hydrxides

Toxicity

none

Formula

(Ca,Na)₂(Ta,Nb)₂O₆F

Unit Cell

a=10,42 Z=8

Physical Properties

Hardness

4 - 5

Streak

yellow

Density

Very Heavy (>6)

Optical Properties

Color

brownyellowgreen

Birefringence

Luster

Vitreous

Transparency

translucent,

transparent

Pleochroism

Geomineralogical Properties

Crystal System

isometric

Composition

Elements

Mass

Na₂O

4,68

CaO

11,24

MnO

0,01

SrO

0,04

BaO

0,02

SnO₂

0,63

UO₂

0,02

Cleavage

Fracture

conchoidal

Tenacity

Brittle

Point Group

Space Group

Habit

Octahedron

Formation

Magmatisch, granitische Pegmatit

Paragenesis

Twinning

Rarity

Rather rare

Synonyms

Fluorcalciomicrolite

Nb₂O₅

3,47

Ta₂O₅

76,02

F

3,96

H₂O

0,48

Brasilien

Groups and Members

Pyrochlor-Supergruppe

Mikrolith-Gruppe