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Minerals - Polyakovite-(Ce) | TerraCollect

Mineral - Polyakovite-(Ce)

Polyakovite-(Ce)(Ce,Ca)₄(Mg,Fe²⁺)(Cr³⁺,Fe³⁺)₂(Ti,Nb)₂(Si₂O₇)₂O₈

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

(Ce,Ca)₄(Mg,Fe²⁺)(Cr³⁺,Fe³⁺)₂(Ti,Nb)₂(Si₂O₇)₂O₈

Unit Cell

a=13,40 b=5,70 c=11,04 β=101° Z=2

Physical Properties

Hardness

5.5 - 6

Streak

brown

Density

Optical Properties

Color

black

Birefringence

Luster

Vitreous

Transparency

translucent,

opaque

Pleochroism

Geomineralogical Properties

Crystal System

monoclinic

Point Group

Composition

Elements

Mass

SiO₂

19,08

TiO₂

9,49

FeO

1,09

Fe₂O₃

4,30

MnO

0,05

MgO

2,61

CaO

1,06

Cleavage

keine

Fracture

conchoidal

Tenacity

Brittle

Space Group

Habit

coarse, massive

Formation

Magmatisch, in Karbonatiten

Paragenesis

Twinning

Rarity

Very rare

Synonyms

Polyakovite-(Ce)

Cr₂O₃

7,42

Nb₂O₅

3,98

ThO₂

2,79

UO₂

0,03

Y₂O₃

0,38

Ce₂O₃

24,24

La₂O₃

15,94

Nd₂O₃

4,76

Pr₂O₃

2,01

Sm₂O₃

0,38

H₂O

0,14

Russland

Groups and Members

Chevkinit-Gruppe