Kostylevite Mineral Data

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.

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),

Physical Properties of Kostylevite

Cleavage:

[110] Perfect

Color:

Colorless, Light yellow.

Density:

2.74

Diaphaniety:

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

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:

r_electron=2.74 gm/cc
note: r_Kostylevite=2.82 gm/cc.

Fermion Index

Fermion Index = 0.03429
Boson Index = 0.96571

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)

Estimated Radioactivity from Kostylevite - barely detectable

Kostylevite Classification

Dana Class:

59.2.1.3 (59)Cyclosilicate Three-Membered Rings

(59.2)hydrated

(59.2.1)Umbite and related species

59.2.1.1 Umbite K2ZrSi3O9·(H2O) P 2₁2₁2₁ 2 2 2

59.2.1.2 Paraumbite K3Zr2HSi6O18·n(H2O)n=3to7 Unk Ortho

59.2.1.3 Kostylevite K2ZrSi3O9·(H2O) P 2₁/a 2/m

Strunz Class:

VIII/E.15-30 VIII - Silicates

VIII/E - Cyklosilicates, six rings [Si6O18]12-

VIII/E.15 - Combeite - Kostylevite series

VIII/E.15-10 Combeite Na2Ca2Si3O9 P 3₂21,P 3₁21 3 2

VIII/E.15-30 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)

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Kostylevite

K2ZrSi3O9·(H2O)
Dana No: 59.2.1.3 Strunz No: VIII/E.15-30
Locality:

Notes: