Keldyshite Mineral Data

Keldyshite Mineral Data +

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General Keldyshite Information

Chemical Formula:

Na2-xHxZrSi2O7·n(H2O)

Composition:

Molecular Weight = 330.41 gm

Sodium 10.44 % Na 14.07 % Na₂O

Zirconium 27.61 % Zr 37.29 % ZrO₂

Silicon 17.00 % Si 36.37 % SiO₂

Hydrogen 1.37 % H 12.27 % H₂O

Oxygen 43.58 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na_1.5H_0.5ZrSi₂O₇·2(H₂O)

IMA Status:

Approved IMA 1962

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 20186

PDF 24-1097

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Keldyshite Crystallography

Axial Ratios:

a:b:c =0.7995:1:0.6506

Cell Dimensions:

a = 6.66, b = 8.33, c = 5.42, Z = 2; alpha = 92.75°, beta = 94.217°, gamma = 72.33° V = 285.40 Den(Calc)= 3.84

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.99(1), 4.18(0.8), 2.97(0.52),

Crystal Structure:

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Khalikov A D , Khomyakov A P , Makhmudov S A , Doklady Akademii Nauk SSSR , 238 (1978) p.573-575, Crystal structure of keldyshite NaZr[Si2O6OH]

Physical Properties of Keldyshite

Cleavage:

[???] Indistinct, [???] Indistinct

Color:

White.

Density:

3.3

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Hardness:

3.5-4.5 - Between Copper Penny and Fluorite-Apatite

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Keldyshite

Gladstone-Dale:

CI meas= 0.061 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.193 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1797,KPDmeas= 0.2091,KC= 0.2228

Optical Data:

Biaxial (?), a=1.67, g=1.71, bire=0.0400, 2V(Meas)=60.

Calculated Properties of Keldyshite

Electron Density:

r_electron=3.22 gm/cc
note: r_Keldyshite=3.30 gm/cc.

Fermion Index

Fermion Index = 0.03912
Boson Index = 0.96088

Photoelectric:

PE_Keldyshite= 37.28 barns/electron
U=PE_Keldyshite x r_electron= 119.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Keldyshite is Not Radioactive

Keldyshite Classification

Dana Class:

55.2.2.1 (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.04-10 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 Keldyshite Information

References:

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 Keldyshite Specimen Label here :

Keldyshite

Na2-xHxZrSi2O7·n(H2O)
Dana No: 55.2.2.1 Strunz No: VIII/C.04-10
Locality:

Notes: