Kokchetavite Mineral Data

Kokchetavite Mineral Data

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General Kokchetavite Information

Chemical Formula:

KAlSi3O8

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

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:

Proposed 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 Crystallography

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 DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6/mmm(?)

Optical Properties of Kokchetavite

Optical Data:

NCalc= 1.51 - from Gladstone-Dale relationship (KC = 0.2058) where Ncalc=Dcalc*KC+1

Calculated Properties of Kokchetavite

Electron Density:

r_electron=2.44 gm/cc
note: r_Kokchetavite=2.46 gm/cc.

Fermion Index

Fermion Index = 0.01437
Boson Index = 0.98563

Photoelectric:

PE_Kokchetavite= 2.85 barns/electron
U=PE_Kokchetavite x r_electron= 6.94 barns/cc.

Radioactivity:

GRapi = 200.97 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Kokchetavite - barely detectable

Kokchetavite Classification

Dana Class:

76.1.8.1 (76)Tectosilicate Al-Si Framework

(76.1)with Al-Si frameworks

(76.1.8)Dana Group

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

Strunz Class:

VIII/J.06-15 VIII - Silicates

VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders

VIII/J.06 - Feldspar group, Buddingtonite - Orthoclase - Slawsonite series

VIII/J.06-10 Buddingtonite (NH4)AlSi3O8·0.5(H2O) P 2₁ or P 2₁/m Mono

VIII/J.06-15 Kokchetavite KAlSi3O8 P 6/mmm(?) 6/m 2/m 2/m

VIII/J.06-20 Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m

VIII/J.06-30 Microcline KAlSi3O8 C1 1

VIII/J.06-35 Rubicline! (Rb,K)AlSi3O8 P1 1

VIII/J.06-40 Orthoclase KAlSi3O8 C 2/m 2/m

VIII/J.06-50 Hyalophane (K,Ba)Al(Si,Al)3O8 C 2/m 2/m

VIII/J.06-60 Celsian BaAl2Si2O8 I21/c 2/m

VIII/J.06-70 Paracelsian BaAl2Si2O8 P 2₁/c 2/m

VIII/J.06-80 Slawsonite (Sr,Ca)Al2Si2O8 P 2₁/a 2/m

Other Kokchetavite Information

See Also:

Links to other databases for Kokchetavite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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

Kokchetavite

KAlSi3O8
Dana No: 76.1.8.1 Strunz No: VIII/J.06-15
Locality:

Notes: