Khibinskite Mineral Data

General Khibinskite Information

Chemical Formula:

K2ZrSi2O7

Composition:

Molecular Weight = 337.59 gm

Potassium 23.16 % K 27.90 % K₂O

Zirconium 27.02 % Zr 36.50 % ZrO₂

Silicon 16.64 % Si 35.60 % SiO₂

Oxygen 33.18 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₂ZrSi₂O₇

Environment:

Aegirine-rich metasomatic rocks.

IMA Status:

Approved IMA 1974

Locality:

Gakman Valley, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Khibinskite + Pronunciation

Synonym:

ICSD 20100

PDF 26-928

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Khibinskite Crystallography

Axial Ratios:

a:b:c =1.7315:1:1.2702

Cell Dimensions:

a = 19.22, b = 11.1, c = 14.1, Z = 16; beta = 116.5° V = 2,692.07 Den(Calc)= 3.33

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: B2/m

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

By Intensity(I/I_o): 2.76(1), 2.95(0.7), 1.63(0.65),

Crystal Structure:

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Chernov A N , Maksimov B A , Ilyukhin V V , Belov N V , Soviet Physics Doklady , 15 (1971) p.711-713, Crystalline structure of monoclinic modification of K,Zr-diorthosilicate, (K2ZrSi2O7), Locality: synthetic

Physical Properties of Khibinskite

Cleavage:

{001} Perfect, {100} Perfect, {111} Perfect

Color:

White, Light yellow, Colorless.

Density:

3.3 - 3.4, Average = 3.34

Diaphaneity:

Translucent

Fracture:

Even - Flat surfaces (not cleavage) fractured in an even pattern.

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point.

Hardness:

4.5-5.5 - Near Apatite

Luster:

Greasy (Oily)

Streak:

white

Optical Properties of Khibinskite

Gladstone-Dale:

CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.019 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2097,KPDmeas= 0.2085,KC= 0.2057
Ncalc = 1.68 - 1.7

Optical Data:

Biaxial (-), a=1.665, b=1.715, g=1.715, bire=0.0500, 2V(Calc)=0, 2V(Meas)=6-16.

Calculated Properties of Khibinskite

Electron Density:

Bulk Density (Electron Density)=3.22 gm/cc
note: Specific Gravity of Khibinskite =3.35 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Khibinskite= 39.22 barns/electron
U=PE_Khibinskite x r_electron= 126.09 barns/cc.

Radioactivity:

GRapi = 320.74 (Gamma Ray American Petroleum Institute Units)
Concentration of Khibinskite per GRapi unit = 0.31 (%)

Estimated Radioactivity from Khibinskite - barely detectable

Khibinskite Classification

Dana Class:

55.02.02.02 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions

(55.02)with cations in [6] coordination

(55.02.02)Keldyshite group

55.02.02.01 Keldyshite Na2-xHxZrSi2O7•n(H2O) P1 1

55.02.02.02 Khibinskite K2ZrSi2O7 B2/m 2/m

55.02.02.03 Parakeldyshite Na2ZrSi2O7 P1 1

Strunz Class:

09.BC.10 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BC -Si2O7 groups, without non-tetrahedral anions;

09.BC.10 Khibinskite K2ZrSi2O7 B2/m 2/m

09.BC.10 Keldyshite Na2-xHxZrSi2O7•n(H2O) P1 1

09.BC.10 Parakeldyshite Na2ZrSi2O7 P1 1

Other Khibinskite 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 Khibinskite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Khibinskite

K2ZrSi2O7
Dana No: 55.02.02.02 Strunz No: 09.BC.10
Locality:

Notes: