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Kokchetavite

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Formula:
K(AlSi3O8)
System:
Hexagonal
Member of:
Name:
For locality.
Metastable polymorph. Found within a multiphase inclusion in a clinopyroxene and garnet. Formed likely either due to (1) a precipitate of infiltrated K-rich melt, during exhumation, or (2) dehydration of the HP phase 'K-cymrite'.

Classification of Kokchetavite

Approved
Approval Year:
2004
9.FA.75

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions
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http://www.mindat.org/min-27460.html
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Type Occurrence of Kokchetavite

General Appearance of Type Material:
3-7 micrometer plates and prisms.
Place of Conservation of Type Material:
National Museum of Natural Science, Taichung, Taiwan.
Geological Setting of Type Material:
Ultrahigh-grade granitic and biotite gneiss

Physical Properties of Kokchetavite

Density:
2.45 g/cm3 (Calculated)

Crystallography of Kokchetavite

Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:
P6/mmm
Cell Parameters:
a = 5.27Å, c = 7.82Å
Ratio:
a:c = 1 : 1.484
Unit Cell Volume:
V 188.09 ų
Z:
1

Chemical Properties of Kokchetavite

Formula:
K(AlSi3O8)
All elements listed in formula:

Relationship of Kokchetavite to other Species

Member of:
Other Members of Group:
AlbiteNa(AlSi3O8)
Amazonite
Andesine(Na,Ca)[Al(Si,Al)Si2O8]
AnorthiteCa(Al2Si2O8)
Anorthoclase(Na,K)AlSi3O8
BanalsiteNa2BaAl4Si4O16
Buddingtonite(NH4)(AlSi3)O8
Bytownite(Ca,Na)[Al(Al,Si)Si2O8]
CelsianBa(Al2Si2O8)
DmisteinbergiteCa(Al2Si2O8)
FilatoviteK(Al,Zn)2(As,Si)2O8
HexacelsianBaAl2Si2O8
Hyalophane(K,Ba)[Al(Si,Al)Si2O8]
KumdykoliteNa(AlSi3O8)
Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
MicroclineK(AlSi3O8)
Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
OrthoclaseK(AlSi3O8)
ParacelsianBa(Al2Si2O8)
ReedmergneriteNaBSi3O8
RubiclineRb(AlSi3O8)
SanidineK(AlSi3O8)
SlawsoniteSr(Al2Si2O8)
StronalsiteNa2SrAl4Si4O16
SvyatoslaviteCa(Al2Si2O8)
9.FA.05KaliophiliteKAlSiO4
9.FA.05KalsiliteKAlSiO4
9.FA.05Nepheline(Na,K)AlSiO4
9.FA.05Panunzite(K,Na)AlSiO4
9.FA.05Trikalsilite(K,Na)AlSiO4
9.FA.05Yoshiokaite(Ca,Na)[Al(Al,Si)O4]
9.FA.05MegakalsiliteKAlSiO4
9.FA.10MalinkoiteNaBSiO4
9.FA.15VirgiliteLiAlSi2O6
9.FA.25LisitsyniteKBSi2O6
9.FA.30AdulariaKAlSi3O8
9.FA.30Anorthoclase(Na,K)AlSi3O8
9.FA.30Buddingtonite(NH4)(AlSi3)O8
9.FA.30CelsianBa(Al2Si2O8)
9.FA.30Hyalophane(K,Ba)[Al(Si,Al)Si2O8]
9.FA.30MicroclineK(AlSi3O8)
9.FA.30OrthoclaseK(AlSi3O8)
9.FA.30SanidineK(AlSi3O8)
9.FA.30RubiclineRb(AlSi3O8)
9.FA.30MonalbiteNaAlSi3O8
9.FA.35AlbiteNa(AlSi3O8)
9.FA.35Andesine(Na,Ca)[Al(Si,Al)Si2O8]
9.FA.35AnorthiteCa(Al2Si2O8)
9.FA.35Bytownite(Ca,Na)[Al(Al,Si)Si2O8]
9.FA.35Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
9.FA.35Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
9.FA.35ReedmergneriteNaBSi3O8
9.FA.40ParacelsianBa(Al2Si2O8)
9.FA.45SvyatoslaviteCa(Al2Si2O8)
9.FA.45KumdykoliteNa(AlSi3O8)
9.FA.50SlawsoniteSr(Al2Si2O8)
9.FA.55LisetiteCaNa2Al4Si4O16
9.FA.60BanalsiteNa2BaAl4Si4O16
9.FA.60StronalsiteNa2SrAl4Si4O16
9.FA.65DanburiteCaB2Si2O8
9.FA.65MaleeviteBaB2Si2O8
9.FA.65PekoviteSrB2Si2O8
9.FA.70Lingunite(Na,Ca)AlSi3O8

Other Names for Kokchetavite

Name in Other Languages:
Simplified Chinese:库克塔切夫石
Traditional Chinese:庫克塔切夫石

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Kokchetavite

Reference List:
Contrib. Mineral, Petrol., 148, 380-389.

Hwang, S.L., Yui, T.F., Chu, H.T., Shen, P., Liou, J.G., Sobolev, N.V. (2013): Oriented kokchetavite compound rods in clinopyroxene of Kokchetav ultrahigh-pressure rocks. Journal of Asian Earth Sciences: 63: 56-69.

Mikhno, A.O., Schmidt, U., Korsakov, A.V. (2013): Origin of K-cymrite and kokchetavite in the polyphase mineral inclusions from Kokchetav UHP calc-silicate rocks: evidence from confocal Raman imaging. European Journal of Mineralogy: 25: 807-816

Internet Links for Kokchetavite

Localities for Kokchetavite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Kazakhstan
 
  • Akmola Province (Aqmola Oblysy; Akmolinskaya Oblast')
    • Kokshetau (Kökshetau; Kokchetau; Kokchetav)
S.L. Hwang, T.F. Yui, H.T. Chu, P. Shen, J.G. Liou, N.V. Sobolev (2013): Oriented kokchetavite compound rods in clinopyroxene of Kokchetav ultrahigh-pressure rocks. Journal of Asian Earth Sciences, 63, 56-69.
    • Prirechnoye
      • Lake Kumdikol (Lake Kumdykol'; Ozero Kumdykol')
IMA Website
Poland
 
  • Dolnośląskie
    • Sudetes Mts.
      • West Sudetes Mts.
        • Orlica-Śnieżnik Dome
Ferrero, S., Ziemann, M.A., Angel, R.J., O'Brien, P.J., Wunder, B. (2015): Kumdykolite, kokchetavite, and cristobalite crystallized in nanogranites from felsic granulites, Orlica-Śnieżnik Dome (Bohemian Massif): not evidence for ultrahigh-pressure conditions. Contributions to Mineralogy and Petrology: 171(3): 2-13
Mineral and/or Locality  
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