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Kokchetavite

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

Volume (ų)

188.087

Crystal 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

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

Locations with GPS information

IDs

GUSID (Global unique identifier short form) Y4ZBLCsZcEi4cs2huGKuYg
GUID (Global unique identifier) 2C418663-192B-4870-B872-CDA1B862AE62
Database ID 2014