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Eastonite

You find additional specimen at the Geolitho Museum

Collectors Summary

Cleavages vollkommen
Solubility +++ H2SO4, hinterläßt Umrisse von SiO2
Crystal System monoklin, C2

Chemism

Chemical formula

KMg2Al[(OH)2|Al2Si2O10]

Chemical composition

Aluminium, Magnesium, Silicium, Kalium, Sauerstoff, Wasserstoff

Unit weight: 418.8331586 u; Number of atoms in the formula: 22

Info

Empirical formula:

KMg2Al[(OH)2Al2Si2O10]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.48

2

9.09

1.0079470

2.0158940
Oxygen

O

45.84

12

54.55

15.9994300

191.9931600
Magnesium

Mg

11.61

2

9.09

24.3050600

48.6101200
Aluminium

Al

19.33

3

13.64

26.9815382

80.9446146
Silicon

Si

13.41

2

9.09

28.0855300

56.1710600
Potassium

K

9.34

1

4.55

39.0983100

39.0983100

Analysis wt%

SiO2 : 28.69, Al2O3 : 36.52, MgO : 19.25, K2O : 11.25, H2O : 4.30 (Ref: berechnet)

Strunz 9th edition incl. updates

9.EC.20

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
C: Schichtsilikate (Phyllosilikate) mit Glimmer Tafeln, zusammengesetzt aus tetrahedralen oder octahedralen Netzen
20:Phlogopit-Gruppe

Lapis Classification

VIII/H.11-150

VIII: SILIKATE
H: Schichtsilikate
11: Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen; Glimmer-Gruppe; Lithionit/Biotit-Reihe

Classification by Hölzel

9.ED.120

9: SILICATES
E: Phyllosilicates
D: Biotite-Group

IMA status

Neudefinition von der CNMNC anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Mica group  ⇒ True micas

Optical Properties

max. Birefringence

0.036
Birefringence chart\! Eastonite title=Birefringence chart Eastonite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.542

RI value β

1.577

RI value γ / ε

1.578

Ri mean

1.566

2V angle

Biaxial (-) small

Crystallography

Crystal System

monoklin

Class (H-M)

2

Space Group number

5

Space Group

C2

Cell parameters α

90°

Cell parameters γ

90°

Physical Properties

Cleavages

vollkommen

Instability

+++ H2SO4, hinterläßt Umrisse von SiO2

(Co-)Type locality

(Co-)Type locality

USA/Pennsylvania/Northampton Co./Easton/Chestnut Hill

Preface

Author (Name, Year)

Winchell, 1925

References

Canadian Mineralogist 36 (1998), 905

IMA group assignments

Other languages

German

Eastonit

Spanish

Eastonita

French

Eastonite

English

Eastonite

Russian

Истонит

Alternative Name

Simplified Chinese

富镁黑云母

Simplified Chinese

镁黑云母

CNMNC symbol

Symbol

Eas

Locations with GPS information

IDs

GUSID (Global unique identifier short form) Be6u-um3oUaJdNNyecrrAQ
GUID (Global unique identifier) FAAEEE05-B7E9-46A1-8974-D37279CAEB01
Database ID 993