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Kokchetavite

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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'.


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Classification of KokchetaviteHide

Approved
Approval Year:
2004
9.FA.75

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions

Physical Properties of KokchetaviteHide

Density:
2.45 g/cm3 (Calculated)

Chemical Properties of KokchetaviteHide

Formula:
K(AlSi3O8)
IMA Formula:
KAlSi3O8

Crystallography of KokchetaviteHide

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

Type Occurrence of KokchetaviteHide

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
Associated Minerals at Type Locality:

Synonyms of KokchetaviteHide

Other Language Names for KokchetaviteHide

Simplified Chinese:库克塔切夫石
Traditional Chinese:庫克塔切夫石

Relationship of Kokchetavite to other SpeciesHide

Member of:
Other Members of this group:
AlbiteNa(AlSi3O8)Tric. 1
AmazoniteK(AlSi3O8)
Andesine(Na,Ca)[Al(Si,Al)Si2O8]Tric.
AnorthiteCa(Al2Si2O8)Tric. 1 : P1
Anorthoclase(Na,K)AlSi3O8Tric.
BanalsiteNa2BaAl4Si4O16Orth.
Buddingtonite(NH4)(AlSi3)O8Mon. 2 : P21
Bytownite(Ca,Na)[Al(Al,Si)Si2O8]Tric.
CelsianBa(Al2Si2O8)Mon. 2/m
DmisteinbergiteCa(Al2Si2O8)Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
FilatoviteK(Al,Zn)2(As,Si)2O8Mon. 2/m
HexacelsianBaAl2Si2O8Hex. 6/mmm (6/m 2/m 2/m) : P63/mcm
Hyalophane(K,Ba)[Al(Si,Al)Si2O8]Mon.
KumdykoliteNa(AlSi3O8)Orth. mmm (2/m 2/m 2/m) : Pnnm
Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
MicroclineK(AlSi3O8)Tric. 1
Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
OrthoclaseK(AlSi3O8)Mon. 2/m : B2/m
ParacelsianBa(Al2Si2O8)Mon.
ReedmergneriteNaBSi3O8Tric.
RubiclineRb(AlSi3O8)Tric.
SanidineK(AlSi3O8)Mon. 2/m : B2/m
SlawsoniteSr(Al2Si2O8)Mon.
StronalsiteNa2SrAl4Si4O16Orth.
SunstoneA variety of feldspar (microcline or oligoclase, more rarely labradorite) that has schiller, ...
SvyatoslaviteCa(Al2Si2O8)Orth.

Related Minerals - Nickel-Strunz GroupingHide

9.FA.05KaliophiliteKAlSiO4Hex.
9.FA.05KalsiliteKAlSiO4Hex. 6 2 2 : P63 2 2
9.FA.05Nepheline(Na,K)AlSiO4Hex. 6 : P63
9.FA.05Panunzite(K,Na)AlSiO4Hex. 6 : P63
9.FA.05Trikalsilite(K,Na)AlSiO4Hex.
9.FA.05Yoshiokaite(Ca,Na)[Al(Al,Si)O4]Trig. 3 : P3
9.FA.05MegakalsiliteKAlSiO4Hex.
9.FA.10MalinkoiteNaBSiO4Hex. 6 : P63
9.FA.15VirgiliteLiAlSi2O6Hex. 6 2 2 : P62 2 2
9.FA.25LisitsyniteKBSi2O6Orth. 2 2 2 : P2 2 2
9.FA.30AdulariaKAlSi3O8Mon.
9.FA.30Anorthoclase(Na,K)AlSi3O8Tric.
9.FA.30Buddingtonite(NH4)(AlSi3)O8Mon. 2 : P21
9.FA.30CelsianBa(Al2Si2O8)Mon. 2/m
9.FA.30Hyalophane(K,Ba)[Al(Si,Al)Si2O8]Mon.
9.FA.30MicroclineK(AlSi3O8)Tric. 1
9.FA.30OrthoclaseK(AlSi3O8)Mon. 2/m : B2/m
9.FA.30SanidineK(AlSi3O8)Mon. 2/m : B2/m
9.FA.30RubiclineRb(AlSi3O8)Tric.
9.FA.30MonalbiteNaAlSi3O8Mon. 2/m : B2/m
9.FA.35AlbiteNa(AlSi3O8)Tric. 1
9.FA.35Andesine(Na,Ca)[Al(Si,Al)Si2O8]Tric.
9.FA.35AnorthiteCa(Al2Si2O8)Tric. 1 : P1
9.FA.35Bytownite(Ca,Na)[Al(Al,Si)Si2O8]Tric.
9.FA.35Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
9.FA.35Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
9.FA.35ReedmergneriteNaBSi3O8Tric.
9.FA.40ParacelsianBa(Al2Si2O8)Mon.
9.FA.45SvyatoslaviteCa(Al2Si2O8)Orth.
9.FA.45KumdykoliteNa(AlSi3O8)Orth. mmm (2/m 2/m 2/m) : Pnnm
9.FA.50SlawsoniteSr(Al2Si2O8)Mon.
9.FA.55LisetiteCaNa2Al4Si4O16Orth.
9.FA.60BanalsiteNa2BaAl4Si4O16Orth.
9.FA.60StronalsiteNa2SrAl4Si4O16Orth.
9.FA.65DanburiteCaB2Si2O8Orth. mmm (2/m 2/m 2/m)
9.FA.65MaleeviteBaB2Si2O8Orth. mmm (2/m 2/m 2/m) : Pnma
9.FA.65PekoviteSrB2Si2O8
9.FA.70Lingunite(Na,Ca)AlSi3O8Tet. 4/m : I4/m

Other InformationHide

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 KokchetaviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 KokchetaviteHide

Localities for KokchetaviteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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
 
  • Lower Silesia (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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