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Kokchetavite

Additional Functions

Collectors Summary

Crystal System hexagonal, P6/mmm
Morphology 3 - 7 Mikrometer große idiomorphe Kristalle in Multiphaseneinschlüssen in Clinopyroxen und Granat

Chemism

Chem­ical formula

KAlSi3O8

Addi­tional chem. informa­tion

Feldspat Gruppe; Polymorph mit Sanidin, Orthoklas und Mikroklin

Chem­ical com­po­si­tion

Aluminium, Silicium, Kalium, Sauerstoff

Unit weight: 278.3318782 u; Number of atoms in the formula: 13

Info

Empirical formula:

KAlSi3O8

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

45.99

8

61.54

15.9994300

127.9954400

Aluminium

Al

9.69

1

7.69

26.9815382

26.9815382

Silicon

Si

30.27

3

23.08

28.0855300

84.2565900

Potassium

K

14.05

1

7.69

39.0983100

39.0983100

Anal­y­sis wt%

SiO2 : 65.50, Al2O3 : 18.45, K2O : 16.15 (Ref: Contributions to Mineralogy and Petrology 2004)

Strunz 9th edi­tion incl. updates

9.FA.30

9: Silikate (Germanate)
F: Gerüstsilikate (Tektosilikate) ohne zeolithisches H2O
A: Gerüstsilikate (Tektosilicates) ohne weitere [Anionen]
30:Feldspat: Alkali

Lapis Clas­sifica­tion

VIII/J.06-015

VIII: SILIKATE
J: Gerüstsilikate (mit Zeolithen)
6: Ohne tetraederfremde Anionen; Feldspat-Gruppe

Clas­sifica­tion by Hölzel

9.FA.208

9: SILICATES
F: Tektosilicates
A: Without other tetrahedral Anions

Dana 8th edi­tion

76.01.08.01

76: Tektosilicates Tectosilicate Al-Si Framework
01: Tektosilicates Tectosilicate Al-Si Framework with Al-Si frameworks
08: Hexagonal Feldspars (High Pressure)

IMA sta­tus

anerkannt 2004

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

Feldspar group

Crystallography

Crystal Sys­tem

hexagonal

Class (H-M)

6/mmm

Space Group number

191

Space Group

P6/mmm

Cell param­e­ters a (Å)

5.27

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

7.82

Cell param­e­ters a/b or c/a

1.484

Cell param­e­ters c/b

-

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

120°

Z

1

Volumne (ų)

188.087

Kristall struc­ture

Alexandr V. Romanenko; Sergey V. Rashchenko; Alexander G. Sokol; Andrey V. Korsakov; Yurii V. Seryotkin, Konstantin V. Glazyrin, Kira Musiyachenko: Crystal structures of K-cymrite and kokchetavite from single-crystal X-ray diffraction. American Mineralogist Vol.106, Nr. 3 (2021) S. 404-409.

Morphol­ogy

3 - 7 Mikrometer große idiomorphe Kristalle in Multiphaseneinschlüssen in Clinopyroxen und Granat

Crystals 3D

Open larger view

Physical Properties

Density (g/cm³)

2.45 (berechnet)

2.457 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Kasachstan/Aqmola oblysy/Kokchetav Massif/Kumdy Kol

Preface

Occurrences

in einem Granat-Pyroxen-Gestein in einem Ultrahochdruck-Terran, vermutlich als metastabile Phase ausgefällt aus infiltrierten K-reichen Schmelzen während der Exhumierung des Gesteins

Asso­cia­tions

Grossular, Diopsid-Hedenbergit, Glimmer, Cristobalit, Zirkon, Titanit, Silikatglas

Name from

Lokalität

Author (Name, Year)

Hwang & Shen & Chu & Yui & Liou & Sobolev & Zhang & Shatsky & Zayachko

Addi­tional Informa­tion

Feldspatgruppe. Buddingtonit-Orthoklas-Slawsonit-Serie. IMA anerkannt (IMA 2004-011 )

References

Contrib. Mineral, Petrol., 148, 380-389.

IMA group assignments


 
 
 
 
 

 
 
 
(Na,K)AlSi3O8
triklin
C1

 
 
 
(NH4)AlSi3O8·0.5 H2O
monoklin
P21, P21/m

 
 
 
BaAl2Si2O8
monoklin
I2/c

 
 
 
(K,Ba)Al(Si,Al)3O8
monoklin
C2/m

 
 
 
KAlSi3O8
triklin
C1

 
 
 
KAlSi3O8
monoklin
C2/m

 
 
 
(Rb,K)[AlSi3O8]
triklin
P1

 
 
 
(K,Na)(Si,Al)4O8
monoklin
C2/m

 
 
BaNa2Al4Si4O16
orthorhombisch
Iba2

 
 
CaAl2Si2O8
hexagonal
P6/mmm

 
 
K[(Al,Zn)2(As,Si)2O8]
monoklin
I2/c

 
 
KAlSi3O8
hexagonal
P6/mmm

 
 
(Na,Ca)AlSi3O8
tetragonal
I4/m

 
 
BaAl2Si2O8
monoklin
P21/a

 
 
 
 
 

 
 
 
NaAlSi3O8
triklin
C1

 
 
 
(Na,Ca)(Si,Al)4O8
triklin
P1

 
 
 
CaAl2Si2O8
triklin
P1

 
 
 
(Ca,Na)(Si,Al)4O8
triklin
I1

 
 
 
(Ca,Na)(Si,Al)4O8
triklin
C1

 
 
 
(Na,Ca)(Si,Al)4O8
triklin
C1

 
 
NaBSi3O8
triklin
C1

 
 
(Sr,Ca)Al2Si2O8
monoklin
P21/a

 
 
SrNa2Al4Si4O16
orthorhombisch
Iba2

 
 
CaAl2Si2O8
orthorhombisch
P21212

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Actuality: 23. Jun 2022 - 04:20:20

Other languages

German

Kokchetavit

English

Kokchetavite

Simplified Chinese

库克塔切夫石

Traditional Chinese

庫克塔切夫石

Alternative Name

Kokchetavita

CNMNC (IMA)-Number

IMA 2004-011

CNMNC symbol

Symbol

Kct

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Kokchetavit
Google-Bilder-Suche - search for: Kokchetavit
Mineralienatlas.de (Forum) - search for: Kokchetavit

English pages

Mindat - search for: Kokchetavite
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Handbook-of-Mineralogy - search for: Kokchetavite
RRUFF - Raman, XRD and other mineral data - search for: Kokchetavite
RRUFF - References and PDF downloads - search for: Kokchetavite
American-Mineralogist-Crystal-Structure-Database - search for: Kokchetavite
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Mineral Dealer

German pages

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