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Keldyshite Mineral Data

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General Keldyshite Information

Help on Chemical  Formula: Chemical Formula: Na2-xHxZrSi2O7•n(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na1.5H0.5ZrSi2O7•2(H2O)
Help on Environment: Environment: A primary mineral in foyaites composed of partly albitized microcline, nepheline, sodalite, aegirine, and alkali amphibole, in a di´┐Żerentiated alkalic massif.
Help on IMA Status: IMA Status: Approved IMA 1962
Help on Locality: Locality: Tavaiok and Angoundasiok Rivers and on Mt. Alluaiv, Lovozero massif, and at Tachtarvumchorr, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Mstislav Vsevolodovich Keldysh (1911-1978), Russian mathematician and President of the Academy of Sciences, Russia.
Help on Name Pronunciation: Name Pronunciation: Keldyshite + Pronunciation Say KELDYSHITE
Help on Synonym: Synonym: ICSD 20186
  PDF 24-1097

Keldyshite Image

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Comments: Gray-white chalk-like keldyshite in and on matrix.
Location: Langdalen, Vestfold, Norway. Scale: Specimen Size 5x7 cm.
© Diederik Visser

Keldyshite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7995:1:0.6506
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.99(1), 4.18(0.8), 2.97(0.52),

Physical Properties of Keldyshite

Help on Cleavage: Cleavage: {???} Indistinct, {???} Indistinct
Help on Color: Color: White.
Help on Density: Density: 3.3
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Hardness: Hardness: 3.5-4.5 - Between Copper Penny and Fluorite-Apatite
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white

Optical Properties of Keldyshite

Help on Gladstone-Dale: 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
Ncalc = 1.74 - 1.86
Help on Optical Data: Optical Data: Biaxial (?), a=1.67, g=1.71, bire=0.0400, 2V(Meas)=60.

Calculated Properties of Keldyshite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.22 gm/cc
note: Specific Gravity of Keldyshite =3.30 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEKeldyshite = 37.28 barns/electron
U=PEKeldyshite x rElectron Density= 119.90 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Keldyshite is Not Radioactive

Keldyshite Classification

Help on  Dana Class: Dana Class: (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.02)with cations in [6] coordination
  (55.02.02)Keldyshite group Keldyshite Na2-xHxZrSi2O7•n(H2O) P1 1 Khibinskite K2ZrSi2O7 B2/m 2/m Parakeldyshite Na2ZrSi2O7 P1 1
Help on  Strunz Class: 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 Keldyshite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Keldyshite :
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

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Dana No: Strunz No: 09.BC.10





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