Khibinskite Mineral Data

Khibinskite Mineral Data +

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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.

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),

Physical Properties of Khibinskite

Cleavage:

[001] Perfect, [100] Perfect, [111] Perfect

Color:

White, Light yellow, Colorless.

Density:

3.3 - 3.4, Average = 3.34

Diaphaniety:

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

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:

r_electron=3.22 gm/cc
note: r_Khibinskite=3.35 gm/cc.

Fermion Index

Fermion Index = 0.03827
Boson Index = 0.96173

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)

Estimated Radioactivity from Khibinskite - barely detectable

Khibinskite Classification

Dana Class:

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

(55.2)with cations in [6] coordination

(55.2.2)Keldyshite group

55.2.2.1 Keldyshite Na2-xHxZrSi2O7·n(H2O) P1 1

55.2.2.2 Khibinskite K2ZrSi2O7 B2/m 2/m

55.2.2.3 Parakeldyshite Na2ZrSi2O7 P1 1

Strunz Class:

VIII/C.04-30 VIII - Silicates

VIII/C - Sorosilicates, with [Si2O7]6-, without anions unfamiliar to tetraheders

VIII/C.04 - Keldyshite - Khibinskite series

VIII/C.04-10 Keldyshite Na2-xHxZrSi2O7·n(H2O) P1 1

VIII/C.04-20 Parakeldyshite Na2ZrSi2O7 P1 1

VIII/C.04-30 Khibinskite K2ZrSi2O7 B2/m 2/m

Other Khibinskite Information

References:

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

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

Khibinskite

K2ZrSi2O7
Dana No: 55.2.2.2 Strunz No: VIII/C.04-30
Locality:

Notes: