Khibinskite Mineral Data
General Khibinskite Information
Chemical Formula:
K2ZrSi2O7
Composition:
Molecular Weight = 337.59 gm
Potassium 23.16 % K 27.90 % K2 O
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:
K2 ZrSi2 O7
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
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 - Prismatic H-M Symbol (2/m) Space Group: B2/m
X Ray Diffraction:
By Intensity(I/Io ): 2.76(1), 2.95(0.7), 1.63(0.65),
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:
PEKhibinskite = 39.22 barns/electronU=PEKhibinskite 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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Khibinskite
K2ZrSi2O7
Dana No: 55.02.02.02 Strunz No: 09.BC.10
Locality:
Notes:
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