Penkvilksite Mineral Data
General Penkvilksite Information
Chemical Formula:
Na4(Ti++++,Zr)2[Si8O22]•4(H2O)
Composition:
Molecular Weight = 858.12 gm
Sodium 10.72 % Na 14.45 % Na2 O
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 % H2 O
Oxygen 48.48 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Na4 Ti1.5 Zr0.5 Si8 O22 •4(H2 O)
IMA Status:
Approved IMA 1974
Locality:
Jubilee pegmatite deposit, Mt. Karnarsut, Lovozero massif, Kola peninsula, Russia. Link to MinDat.org Location Data.
Name Origin:
Named from the Lapp "penk" and "vilkis", white and curly in allusion to its appearance.
Name Pronunciation:
Penkvilksite + Pronunciation
Penkvilksite Image
Images:
Penkvilksite
Comments: Massive white cluster of Penkvilksite.
Location: Lovozero, Kola Peninsula, Russia.
Scale: .5 x 2.5 cm.
© John Veevaert
Penkvilksite Crystallography
Axial Ratios:
a:b:c =1.0262:1:0.8464
Cell Dimensions:
a = 8.956, b = 8.727, c = 7.387, Z = 1; beta = 112.74° V = 532.48 Den(Calc)= 2.68
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21 /c
X Ray Diffraction:
By Intensity(I/Io ): 8.29(1), 3.339(0.9), 2.884(0.8),
Physical Properties of Penkvilksite
Cleavage:
{???} Perfect
Color:
Colorless, White.
Density:
2.63
Diaphaneity:
Transparent
Habit:
Porcelainous - Fine-grained, translucent massive material like broken china
Hardness:
5 - Apatite
Luster:
Pearly
Streak:
white
Optical Properties of Penkvilksite
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
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
Electron Density:
Bulk Density (Electron Density)=2.65 gm/cc note: Specific Gravity of Penkvilksite =2.68 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PEPenkvilksite = 9.45 barns/electronU=PEPenkvilksite x r Electron Density= 25.09 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Penkvilksite is Not Radioactive
Penkvilksite Classification
Dana Class:
70.02.02.01 (70) Inosilicate Column or Tube Structures
(70.02) with Si2O7 dimers
(70.02.02) Dana Group
70.02.02.01 Penkvilksite Na4(Ti,Zr)2[Si8O22]•4(H2O) P 21 /c 2/m
70.02.02.02 Tumchaite ! Na2(Zr,Sn)Si4O11•2(H2O) P 21 /c 2/m
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
References:
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
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
15 - WWW-MINCRYST
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Penkvilksite
Na4(Ti++++,Zr)2[Si8O22]•4(H2O)
Dana No: 70.02.02.01 Strunz No: 09.EA.60
Locality:
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