Kokchetavite Mineral Data (original) (raw)

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

Click Here for Larger Kokchetavite Image in a New Browser Window Images:

Click Here for Larger Kokchetavite Image 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

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 DipyramidalH-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:

76.01.08.01 (76)Tectosilicate Al-Si Framework

(76.01)with Al-Si frameworks

(76.01.08)Hexagonal Feldspars (High Pressure)

76.01.08.01 Kokchetavite! KAlSi3O8 P 6/mmm(?) 6/m 2/m 2/m

76.01.08.02 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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Ask about Kokchetavite here :
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Print or Cut-and-Paste your Kokchetavite Specimen Label here :

Kokchetavite

KAlSi3O8
Dana No: 76.01.08.01 Strunz No: 09.FA.75
Locality:

Notes: