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Minerals - Cordierite | TerraCollect

Mineral - Cordierite

CordieriteMg₂Al₃[AlSi₅O₁₈][

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

Mg₂Al₃[AlSi₅O₁₈][

Unit Cell

a=17.08 b=9.73 c=9.36 Z=4

Physical Properties

Hardness

7 - 7.5

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

bluecolorless

Birefringence

0.018

Luster

Vitreous

Transparency

translucent,

transparent

Pleochroism

X = Gelb-Grün Y = Blau-Violett Z = Blau

Geomineralogical Properties

Crystal System

orthorhombic

Composition

Elements

Mass

SiO₂

50.20

TiO₂

0.01

Al₂O₃

33.50

Fe₂O₃

0.14

FeO

0.84

MnO

0.06

MgO

12.80

Karten-Ebenen

Geologische KarteSatelliten Karte

Cleavage

Imperfect after {100}, indistinct after {001} and {010}

Fracture

conchoidal

Tenacity

Brittle

Point Group

orthorhombic-dipyramidal - 2/m 2/m 2/m

Space Group

Cccm (66)

Habit

granular, prismatic

Formation

Metamorphism

Paragenesis

Twinning

Rarity

Common

Synonyms

Cordierite

CaO

0.23

Na₂O

0.26

K₂O

0.14

H₂O

1.81

Australia (Dana 1892)

Groups and Members

Beryl-Supergroup

Cordierite-Group