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Kokchetavite Mineral Data
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General Kokchetavite Information
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 Chemical Formula: |
KAlSi3O8 |
| Composition: |
Molecular Weight = 278.33 gm |
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Potassium 14.05 % K 16.92 % K2O |
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Aluminum 9.69 % Al 18.32 % Al2O3 |
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Silicon 30.27 % Si 64.76 % SiO2 |
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Oxygen 45.99 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
KAlSi3O8 |
| Environment: |
Micrometer-size inclusions in clinopyroxene and garnet in a garnet-pyroxene rock. Ultrahigh pressure metastable polymorph of K-feldspar. |
| IMA Status: |
Approved IMA 2004 (Dana # Added) |
| Locality: |
Kumdy-Kul, Kokchetav, Kazakhstan. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Synonym: |
IMA2004-011 |
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Kokchetavite Image |
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Images:
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Kokchetavite
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 |
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Kokchetavite Crystallography
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| Axial Ratios: |
a:c = 1:1.48387 |
| Cell Dimensions: |
a = 5.27, c = 7.82, Z = 1; V = 188.09 Den(Calc)= 2.46 |
| Crystal System: |
Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 6/mmm(?) |
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Physical Properties of Kokchetavite
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| Habit: |
Inclusions - Generally found as inclusions in other minerals. |
| Habit: |
Platy - Sheet forms (e.g. micas). |
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Optical Properties of Kokchetavite
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| Optical Data: |
NCalc= 1.51 - from Gladstone-Dale relationship (KC = 0.2058) where Ncalc=Dcalc*KC+1
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Calculated Properties of Kokchetavite
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| Electron Density: |
Bulk Density (Electron Density)=2.44 gm/cc
note: Specific Gravity of Kokchetavite =2.46 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEKokchetavite = 2.85 barns/electron
U=PEKokchetavite x relectron= 6.94 barns/cc.
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| Radioactivity: |
GRapi = 200.97 (Gamma Ray American Petroleum Institute Units)
Concentration of Kokchetavite per GRapi unit = 0.50 (%)
Estimated Radioactivity from Kokchetavite  - barely detectable
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Kokchetavite Classification
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| Dana Class: |
76.01.08.01 (76)Tectosilicate Al-Si Framework |
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(76.01)with Al-Si frameworks |
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(76.01.08)Hexagonal Feldspars (High Pressure) |
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76.01.08.01 Kokchetavite! KAlSi3O8 P 6/mmm(?) 6/m 2/m 2/m |
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76.01.08.02 Kumdykolite NaAlSi3O8 P 2nn or Pmnn Ortho |
| Strunz Class: |
09.FA.75 09 - SILICATES (Germanates) |
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09.F - Tektosilicates without Zeolitic H2O |
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09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1 |
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09.FA.75 Kokchetavite! KAlSi3O8 P 6/mmm(?) 6/m 2/m 2/m |
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Other Kokchetavite Information
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| References: |
NAME( AmMin, v90, p 1228) PHYS. PROP.(AmMin, v90, p 1228) |
| 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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Print or Cut-and-Paste your Kokchetavite Specimen Label here :
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Kokchetavite
KAlSi3O8
Dana No: 76.01.08.01 Strunz No: 09.FA.75
Locality:
Notes:
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