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Minerals - Leucite | TerraCollect

Mineral - Leucite

LeuciteK[AlSi₂O₆]

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

K[AlSi₂O₆]

Unit Cell

a=13.06 c=13.75 Z=16

Physical Properties

Hardness

5.5 - 6

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

whitegrayredcolorless

Birefringence

0.001

Luster

Vitreous

Transparency

translucent,

opaque

Pleochroism

Geomineralogical Properties

Crystal System

Composition

Elements

Mass

SiO₂

54.60

TiO₂

0.03

Al₂O₃

21.97

Fe₂O₃

0.89

FeO

0.14

CaO

0.10

Na₂O

0.23

Karten-Ebenen

Geologische KarteSatelliten Karte

Cleavage

Indistinct after {110}

Fracture

conchoidal

Tenacity

Brittle

tetragonal

Point Group

tetragonal-dipyramidal - 4/m

Space Group

I41/a (88)

Habit

massive

Formation

Magmatic, formed by crystallization from silicate melts with low SiO₂ content (silica-undersaturated) and high K₂O content, typically in effusive alkaline rocks such as phonolites or leucitites.

Paragenesis

Twinning

Rarity

Rather rare

Synonyms

Leucite

K₂O

21.45

Italien (Dana 1895)

Groups and Members

Zeolite-Group

ANA-Zeolite-Subgroup