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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

 
Mica group
 
 
 

 
 
True micas
 
 
 

 
 
 
Aluminoceladonite
K(Mg,Fe2+)Al[(OH)2|Si4O10]
monoklin
 

 
 
 
Annite
KFe2+3(Si3Al)O10(OH,F)2
monoklin
C2/m

 
 
 
Aspidolite
NaMg3(AlSi3)O10(OH)2
monoklin
C2/m

 
 
 
Boromuscovite
KAl2(Si3B)O10(OH,F)2
monoklin
C2/m

 
 
 
Celadonite
K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2
monoklin
C2

 
 
 
Chromphyllite
K(Cr,Al)2[(OH,F)2|AlSi3O10]
monoklin
C2/c

 
 
 
Eastonite
KMg2Al[(OH)2|Al2Si2O10]
monoklin
C2

 
 
 
Ephesite
NaLiAl2(Al2Si2)O10(OH)2
monoklin
Cc

 
 
 
Ferroaluminoceladonite
K(Fe2+,Mg)(Al,Fe3+)[(OH)2|Si4O10]
monoklin
C2/m

 
 
 
Ferroceladonite
K(Fe2+,Mg)(Fe3+,Al)[(OH)2|Si4O10]
monoklin
C2/m

 
 
 
Fluorannite
KFe32+[(F,OH)2|AlSi3O10]
monoklin
C2/m

 
 
 
Ganterite
(Ba,Na,K)(Al,Mg)2[(OH,F)2|(Al,Si)Si2O10]
monoklin
C2/c

 
 
 
Hendricksite
K(Zn,Mn)3Si3AlO10(OH)2
monoklin
C2/m

 
 
 
Masutomilite
K(Li,Al,Mn2+)3(Si,Al)4O10(F,OH)2
monoklin
C2

 
 
 
Montdorite
KMn0.52+Fe1.52+Mg0.5[F2|Si4O10]
monoklin
C2/m

 
 
 
Muscovite
KAl2(Si3Al)O10(OH,F)2
monoklin
C2/c

 
 
 
Nanpingite
CsAl2(Si,Al)4O10(OH,F)2
monoklin
C2/c

 
 
 
Norrishite
KLiMn3+2Si4O12
monoklin
C2/m

 
 
 
Paragonite
NaAl2(Si3Al)O10(OH)2
monoklin
C2/c

 
 
 
Phlogopite
KMg3(Si3Al)O10(F,OH)2
monoklin
C2/m

 
 
 
Polylithionite
KLi2AlSi4O10(F,OH)2
monoklin
C2/m

 
 
 
Preiswerkite
NaMg2Al3Si2O10(OH)2
monoklin
C2/m

 
 
 
Roscoelite
K(V,Al,Mg)2AlSi3O10(OH)2
monoklin
C2/m

 
 
 
Shirozulite
K(Mn2+,Mg)3[(OH)2|AlSi3O10]
 
 

 
 
 
Siderophyllite
KFe22+Al(Al2Si2)O10(F,OH)2
monoklin
C2/m

 
 
 
Sokolovaite
CsLi2AlSi4O10F2
monoklin
 

 
 
 
Tainiolite
KLiMg2Si4O10F2
monoklin
C/2m

 
 
 
Tetraferriannite
KFe2+3(Si3Fe3+)O10(OH)2
monoklin
C2/m

 
 
 
Tetraferriphlogopite
KMg3[(F,OH)2|(Al,Fe3+)Si3O10]
monoklin
C2/m

 
 
 
Tobelite
(NH4,K)Al2(Si3Al)O10(OH)2
monoklin
C2/m

 
 
 
Trilithionite
KLi1.5Al1.5[F2|AlSi3O10]
monoklin
C2/m

 
 
 
Yangzhumingite
KMg2.5Si4O10F2
monoklin
C2/m

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Actuality: 12. Sep 2024 - 19:13:00

Other languages

German

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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