Mineralogy Database

Kokchetavite Mineral Data

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General Kokchetavite Information

Help on Chemical  Formula: Chemical Formula: KAlSi3O8
Help on Composition: Composition: Molecular Weight = 278.33 gm
   Potassium  14.05 %  K    16.92 % K2O
   Aluminum    9.69 %  Al   18.32 % Al2O3
   Silicon    30.27 %  Si   64.76 % SiO2
   Oxygen     45.99 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KAlSi3O8
Help on Environment: Environment: Micrometer-size inclusions in clinopyroxene and garnet in a garnet-pyroxene rock. Ultrahigh pressure metastable polymorph of K-feldspar.
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Kumdy-Kul, Kokchetav, Kazakhstan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: IMA2004-011

Kokchetavite Image

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Comments: Fragment of eclogite containing kokchetavite which occurs as inclusions in clinopyroxene and garnet (see inset BSE images).
Location: Kumde-Kul Area, Kokchetav Massif, Kokchetav Oblast', Kazakhstan. Scale: Specimen Size 6x6x6 mm.
© Sergey Vasiliev / Systematic Mineralogy

Kokchetavite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.48387
Help on Cell Dimensions: Cell Dimensions: a = 5.27, c = 7.82, Z = 1; V = 188.09 Den(Calc)= 2.46
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 6/mmm(?)

Physical Properties of Kokchetavite

Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).

Optical Properties of Kokchetavite

Help on Optical Data: Optical Data: NCalc= 1.51 - from Gladstone-Dale relationship (KC = 0.2058) where Ncalc=Dcalc*KC+1

Calculated Properties of Kokchetavite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.44 gm/cc
note: Specific Gravity of Kokchetavite =2.46 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEKokchetavite = 2.85 barns/electron
U=PEKokchetavite x relectron= 6.94 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 200.97 (Gamma Ray American Petroleum Institute Units)
Concentration of Kokchetavite per GRapi unit = 0.50 (%)

Estimated Radioactivity from Kokchetavite - barely detectable


Kokchetavite Classification

Help on  Dana Class: Dana Class: (76)Tectosilicate Al-Si Framework
  (76.01)with Al-Si frameworks
  (76.01.08)Hexagonal Feldspars (High Pressure) Kokchetavite! KAlSi3O8 P 6/mmm(?) 6/m 2/m 2/m Kumdykolite NaAlSi3O8 P 2nn or Pmnn Ortho
Help on  Strunz Class: Strunz Class: 09.FA.75 09 - SILICATES (Germanates)
  09.F - Tektosilicates without Zeolitic H2O
  09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1
09.FA.75 Kokchetavite! KAlSi3O8 P 6/mmm(?) 6/m 2/m 2/m

Other Kokchetavite Information

Help on References: References: NAME( AmMin, v90, p 1228) PHYS. PROP.(AmMin, v90, p 1228)
Help on See Also: See Also: Links to other databases for Kokchetavite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 09.FA.75





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