Kostylevite Mineral Data

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General Kostylevite Information

Chemical Formula:

K2ZrSi3O9•(H2O)

Composition:

Molecular Weight = 415.69 gm

Potassium 18.81 % K 22.66 % K₂O

Zirconium 21.95 % Zr 29.64 % ZrO₂

Silicon 20.27 % Si 43.36 % SiO₂

Hydrogen 0.48 % H 4.33 % H₂O

Oxygen 38.49 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₂•(H₂O)ZrSi₃O₉

Environment:

Alkalic pegmatite intergrown with umbite and wadeite.

IMA Status:

Approved IMA 1983

Locality:

Yuonnemiok River Valley, eastern Khibiny Massif, Kola Peninsula, Russa. Link to MinDat.org Location Data.

Name Origin:

Named for Yekaterina Eutikhievna Kostyleva-Labuntsova (1894-1974), Russian Mineralogist.

Name Pronunciation:

Kostylevite + Pronunciation

Synonym:

ICSD 20147

PDF 37-459

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Kostylevite Crystallography

Axial Ratios:

a:b:c =1.124:1:0.5602

Cell Dimensions:

a = 13.171, b = 11.717, c = 6.565, Z = 4; beta = 105.26° V = 977.42 Den(Calc)= 2.82

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.087(1), 5.6(0.6), 3.336(0.53),

Crystal Structure:

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Ilyukhin V V , Khomyakov A P , Shumyatskaya N G , Voronkov A A , Nevskii N N , Belov N V , Soviet Physics Doklady , 26 (1981) p.118-120, The crystal structure of the new natural zirconosilicate K4Zr2Si6O18*2H2O, Locality: Khibinsk massif, Kola Peninsula, Russia, Note: dimorphic with umbite, Note: y(O7) corrected

Physical Properties of Kostylevite

Cleavage:

{110} Perfect

Color:

Colorless, Light yellow.

Density:

2.74

Diaphaneity:

Transparent

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Kostylevite

Gladstone-Dale:

CI meas= -0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2131,KPDmeas= 0.2193,KC= 0.2119
Ncalc = 1.58 - 1.6

Optical Data:

Biaxial (?), a=1.595, b=1.598, g=1.61, bire=0.0150, 2V(Calc)=54, 2V(Meas)=48.

Calculated Properties of Kostylevite

Electron Density:

Bulk Density (Electron Density)=2.74 gm/cc
note: Specific Gravity of Kostylevite =2.82 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Kostylevite= 31.74 barns/electron
U=PE_Kostylevite x r_electron= 86.98 barns/cc.

Radioactivity:

GRapi = 263.80 (Gamma Ray American Petroleum Institute Units)
Concentration of Kostylevite per GRapi unit = 0.38 (%)

Estimated Radioactivity from Kostylevite - barely detectable

Kostylevite Classification

Dana Class:

59.02.01.03 (59)Cyclosilicate Three-Membered Rings

(59.02)hydrated

(59.02.01)Umbite and related species

59.02.01.01 Umbite K2ZrSi3O9•(H2O) P 2₁2₁2₁ 2 2 2

59.02.01.02 Paraumbite K3Zr2HSi6O18•n(H2O)n=3to7 Unk Ortho

59.02.01.03 Kostylevite K2ZrSi3O9•(H2O) P 2₁/a 2/m

Strunz Class:

09.CJ.35 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CJ -[Si6O18]12- 6-membered single rings (sechser-Einfachringe),

09.CJ.35 Kostylevite K2ZrSi3O9•(H2O) P 2₁/a 2/m

Other Kostylevite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Kostylevite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Kostylevite

K2ZrSi3O9•(H2O)
Dana No: 59.02.01.03 Strunz No: 09.CJ.35
Locality:

Notes: