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Penkvilksite Mineral Data

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General Penkvilksite Information

Help on Chemical  Formula: Chemical Formula: Na4(Ti++++,Zr)2[Si8O22]•4(H2O)
Help on Composition: Composition: Molecular Weight = 858.12 gm
   Sodium     10.72 %  Na   14.45 % Na2O
   Zirconium   5.32 %  Zr    7.18 % ZrO2
   Titanium    8.37 %  Ti   13.96 % TiO2
   Silicon    26.18 %  Si   56.01 % SiO2
   Hydrogen    0.94 %  H     8.40 % H2O
   Oxygen     48.48 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na4Ti1.5Zr0.5Si8O22•4(H2O)
Help on IMA Status: IMA Status: Approved IMA 1974
Help on Locality: Locality: Jubilee pegmatite deposit, Mt. Karnarsut, Lovozero massif, Kola peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Lapp "penk" and "vilkis", white and curly in allusion to its appearance.
Help on Name Pronunciation: Name Pronunciation: Penkvilksite + Pronunciation Say PENKVILKSITE

Penkvilksite Image

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Comments: Massive white cluster of Penkvilksite.
Location: Lovozero, Kola Peninsula, Russia. Scale: .5 x 2.5 cm.
© John Veevaert

Penkvilksite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0262:1:0.8464
Help on Cell Dimensions: Cell Dimensions: a = 8.956, b = 8.727, c = 7.387, Z = 1; beta = 112.74° V = 532.48 Den(Calc)= 2.68
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.29(1), 3.339(0.9), 2.884(0.8),

Physical Properties of Penkvilksite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.63
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Porcelainous - Fine-grained, translucent massive material like broken china
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Pearly
Help on Streak: Streak: white

Optical Properties of Penkvilksite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.025 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2439,KPDmeas= 0.2485,KC= 0.2425
Ncalc = 1.64 - 1.65
Help on Optical Data: Optical Data: Biaxial (+), a=1.64, b=1.646, g=1.675, bire=0.0350, 2V(Calc)=50, 2V(Meas)=50.

Calculated Properties of Penkvilksite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.65 gm/cc
note: Specific Gravity of Penkvilksite =2.68 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEPenkvilksite = 9.45 barns/electron
U=PEPenkvilksite x rElectron Density= 25.09 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Penkvilksite is Not Radioactive

Penkvilksite Classification

Help on  Dana Class: Dana Class: (70)Inosilicate Column or Tube Structures
  (70.02)with Si2O7 dimers
  (70.02.02)Dana Group Penkvilksite Na4(Ti,Zr)2[Si8O22]•4(H2O) P 21/c 2/m Tumchaite! Na2(Zr,Sn)Si4O11•2(H2O) P 21/c 2/m
Help on  Strunz Class: Strunz Class: 09.EA.60 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EA -Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
09.EA.60 Penkvilksite Na4(Ti,Zr)2[Si8O22]•4(H2O) P 21/c 2/m
09.EA.60 Tumchaite! Na2(Zr,Sn)Si4O11•2(H2O) P 21/c 2/m

Other Penkvilksite Information

Help on References: References: NAME( Dana8) 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 Penkvilksite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
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.EA.60





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