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Minerals - Stibiotantalite | TerraCollect

Mineral - Stibiotantalite

StibiotantaliteSb(Ta,Nb)O₄

Chemical Properties

Mineral Class

Oxides and Hydrxides

Toxicity

none

Formula

Sb(Ta,Nb)O₄

Unit Cell

a=4,91 b=11,81 c=5,54 Z=4

Physical Properties

Hardness

5.5

Streak

brownyellowyellow brown

Optical Properties

Color

brownorangeyellow

Birefringence

0,083

Luster

Adamantine,

Resinous

Transparency

translucent,

transparent

Pleochroism

Geomineralogical Properties

Crystal System

Composition

Elements

Mass

Nb₂O₅

11,30

Ta₂O₅

43,30

SiO₂

0,10

Sb₂O₃

40,30

Bi₂O₃

3,80

CaO

0,10

Kalifornien

Groups and Members

Cervantit-Gruppe

Density

Very Heavy (>6)

Cleavage

Deutlich auf (001), undeutlich auf (100)

Fracture

conchoidal,

uneven

Tenacity

Brittle

orthorhombic

Point Group

Space Group

Habit

blocky, prismatic, tabular

Formation

Magmatisch, Granit-Pegmatite

Paragenesis

Twinning

Kontaktzwillingen nach (010)

Rarity

Rarely

Synonyms

Stibiotantalite