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Minerals - Mountainite | TerraCollect

Mineral - Mountainite

MountainiteKNa₂Ca₂[Si₈O₁₉(OH)] · 6H₂O

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

KNa₂Ca₂[Si₈O₁₉(OH)] · 6H₂O

Unit Cell

a=13,51 b=6,55 c=13,51 β=104° Z=8

Physical Properties

Hardness

3

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

white

Birefringence

0,014

Luster

Silky

Transparency

translucent,

transparent

Pleochroism

Geomineralogical Properties

Crystal System

monoclinic

Point Group

Composition

Elements

Mass

SiO₂

51,57

Al₂O₃

2,31

CaO

10,07

MgO

0,01

Na₂O

10,15

K₂O

4,43

H₂O

17,76

Cleavage

Undeutlich

Fracture

Tenacity

Space Group

Habit

leafy, crusty, massive, acicular, rosette

Formation

Magmatisch, in alkalischen Pegmatiten, in Kimberliten

Paragenesis

Twinning

Rarity

Very rare

Synonyms

Mountainite

CO₂

0,87

Russland