Mineralogy Database

Parakeldyshite Mineral Data

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General Parakeldyshite Information

Help on Chemical  Formula: Chemical Formula: Na2ZrSi2O7
Help on Composition: Composition: Molecular Weight = 305.37 gm
   Sodium     15.06 %  Na   20.30 % Na2O
   Zirconium  29.87 %  Zr   40.35 % ZrO2
   Silicon    18.39 %  Si   39.35 % SiO2
   Oxygen     36.68 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2ZrSi2O7
Help on Environment: Environment: As masses in nepheline syenite pegmatites which cut a foyaite.
Help on IMA Status: IMA Status: Approved IMA 1975
Help on Locality: Locality: Mt. Takhtarvumchorr and elsewhere in the Khibiny massif, and on Mt. Alluaiv and elsewhere in the Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek para, for near, and its relation to keldyshite.
Help on Name Pronunciation: Name Pronunciation: Parakeldyshite + Pronunciation Say PARAKELDYSHITE
Help on Synonym: Synonym: ICSD 24866
  PDF 39-209

Parakeldyshite Image

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Comments: White pearly crystalline parakeldyshite in rock.
Location: Lagendalen, Larvik, Vestfold, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Parakeldyshite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8201:1:1.3328
Help on Cell Dimensions: Cell Dimensions: a = 5.419, b = 6.607, c = 8.806, Z = 2; alpha = 71.5°, beta = 87.15°, gamma = 85.63° V = 297.75 Den(Calc)= 3.41
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): 3.963(1), 2.913(0.9), 4.179(0.8),

Physical Properties of Parakeldyshite

Help on Color: Color: Bluish white, White.
Help on Density: Density: 3.39
Help on Diaphaneity: Diaphaneity: Translucent
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luminescence: Luminescence: Fluorescent, Short UV=orange-white.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Parakeldyshite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2034,KPDmeas= 0.204,KC= 0.2056
Ncalc = 1.7
Help on Optical Data: Optical Data: Biaxial (-), a=1.67, b=1.692, g=1.713, bire=0.0430
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.

Calculated Properties of Parakeldyshite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.24 gm/cc
note: Specific Gravity of Parakeldyshite =3.39 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEParakeldyshite = 41.12 barns/electron
U=PEParakeldyshite x rElectron Density= 133.28 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Parakeldyshite is Not Radioactive

Parakeldyshite 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 Parakeldyshite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990;www.saint-hilaire.ca) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Parakeldyshite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: Strunz No: 09.BC.10





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