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Minerals - Janhaugite | TerraCollect

Mineral - Janhaugite

Janhaugite(Na,Ca)₃(Mn²⁺,Fe²⁺)₃(Ti,Zr,Nb)₂(Si₂O₇)₂O₂(OH,F)₂

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

(Na,Ca)₃(Mn²⁺,Fe²⁺)₃(Ti,Zr,Nb)₂(Si₂O₇)₂O₂(OH,F)₂

Unit Cell

a=10,67 b=9,79 c=13,93 β=108° Z=4

Physical Properties

Hardness

5

Streak

brown

Density

Normal (2-3,5)

Optical Properties

Color

brownredorange

Birefringence

0,140

Luster

Vitreous

Transparency

translucent,

opaque

Pleochroism

Geomineralogical Properties

Crystal System

monoclinic

Composition

Elements

Mass

SiO₂

29,8

TiO₂

15,2

ZrO₂

6,0

Nb₂O₅

5,0

Ta₂O₅

0,3

FeO

5,5

MnO

22,3

Cleavage

Deutlich auf {010}

Fracture

nd

Tenacity

Brittle

Point Group

Space Group

Habit

massive

Formation

Magmatisch, In Miarolen von natriumreichen Granitpegmatiten

Paragenesis

Twinning

Selten nach {100}

Rarity

Rare

Synonyms

Janhaugite

CaO

1,5

Na₂O

11,0

K₂O

0,2

F

2,7

H₂O

1,6

Norwegen

Groups and Members

Wöhlerit-Gruppe