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About PenkvilksiteHide

Na4Ti2Si8O22 · 4H2O
Silky, Pearly, Dull
Specific Gravity:
Crystal System:
Named from the Lapp words "penk" and "vilkis", meaning "white" and "curly", because of its appearance.
This page provides mineralogical data about Penkvilksite.

Classification of PenkvilksiteHide

First Published:

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings

70 : INOSILICATES Column or Tube Structures
2 : Column or Tube Structures with Si2O7 dimers

14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf

Physical Properties of PenkvilksiteHide

Silky, Pearly, Dull
2.58 g/cm3 (Measured)    

Optical Data of PenkvilksiteHide

Biaxial (+)
RI values:
nα = 1.640 nβ = 1.646 nγ = 1.675
Measured: 50° , Calculated: 50°
Max Birefringence:
δ = 0.035
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
relatively weak

Chemical Properties of PenkvilksiteHide

Na4Ti2Si8O22 · 4H2O
IMA Formula:
Na2TiSi4O11 · 2H2O

Crystallography of PenkvilksiteHide

Crystal System:
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cell Parameters:
a = 16.3721(5) Å, b = 8.7492(3) Å, c = 7.4020(2) Å
a:b:c = 1.871 : 1 : 0.846
Unit Cell V:
1,060.28 ų (Calculated from Unit Cell)

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0001688PenkvilksiteMerlino S, Pasero M, Artioli G, Khomyakov A P (1994) Penkvilksite, a new kind of silicate structure: OD character, X-ray single-crystal (1M), and powder Rietveld (2O) refinements of two MDO polytypes American Mineralogist 79 1185-119319940293
0001689PenkvilksiteMerlino S, Pasero M, Artioli G, Khomyakov A P (1994) Penkvilksite, a new kind of silicate structure: OD character, X-ray single-crystal (1M), and powder Rietveld (2O) refinements of two MDO polytypes Data has been corrected according to the ICSD American Mineralogist 79 1185-119319940293
0010347PenkvilksiteCadoni M, Ferraris G (2008) Penkvilksite-2O: Na2TiSi4O11*2H2O Acta Crystallographica C64 i87-i902008synthetic0293
CIF Raw Data - click here to close

Type Occurrence of PenkvilksiteHide

Place of Conservation of Type Material:
Fersman Mineralogical Museum, Acad. Sci. USSR, Moscow.
Bussen, I.V., Men'shikov, Yu.P., Merkov, A.M., Nedorezova, A.P., Uspenskaya, E.I., Khomyakov, A.P. (1974) Penkvilksite, a new hydrous silicate of titanium and sodium.Doklady Akademii Nauk SSSR: 217: 1161-1164

Synonyms of PenkvilksiteHide

Other Language Names for PenkvilksiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
7 photos of Penkvilksite associated with RaiteNa4Mn2+3Ti0.25Si8O20(OH)2 · 10H2O
5 photos of Penkvilksite associated with ZoriteNa8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2O
3 photos of Penkvilksite associated with AegirineNaFe3+Si2O6
1 photo of Penkvilksite associated with TerskiteNa4ZrSi6O16 · 2H2O

Related Minerals - Nickel-Strunz GroupingHide

9.EA.Bussyite-(Y)(Y,REE,Ca)3(Na,Ca)6MnSi9Be5(O,OH,F)34Mon. 2 : B2
9.EA.05CuprorivaiteCaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.05EffenbergeriteBaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.10EkaniteCa2ThSi8O20Tet. 4 2 2 : I4 2 2
9.EA.15Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mnc
9.EA.15Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2OTet.
9.EA.15Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2OOrth.
9.EA.20MagadiiteNa2Si14O29 · 11H2OMon.
9.EA.30Sazhinite-(Ce)Na2CeSi6O14 · 6H2OOrth. mm2 : Pmm2
9.EA.30Sazhinite-(La)Na3La[Si6O15] · 2H2OOrth. mm2 : Pmm2
9.EA.35ArmstrongiteCaZr[Si6O15] · 3H2OMon.
9.EA.40OkeniteCa10Si18O46 · 18H2OTric. 1 : P1
9.EA.45NekoiteCa3Si6O15 · 7H2OTric. 1 : P1
9.EA.50CavansiteCa(VO)Si4O10 · 4H2OOrth. mmm (2/m 2/m 2/m)
9.EA.55PentagoniteCa(VO)Si4O10 · 4H2OOrth. mm2
9.EA.60TumchaiteNa2Zr(Si4O11) · 2H2OMon.
9.EA.65NabesiteNa2BeSi4O10 · 4H2OOrth. 2 2 2 : P21 21 21
9.EA.70Ajoite(K,Na)Cu7AlSi9O24(OH)6 · 3H2OTric.
9.EA.75ZeravshaniteNa2Cs4Zr3[Si18O45]*2H2OMon. 2/m : B2/b
9.EA.80Bussyite-(Ce)(Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4Mon. 2/m : B2/b
9.EA.85PlumbophyllitePb2Si4O10 · H2OOrth. mmm (2/m 2/m 2/m) : Pbcn

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.10.1ZirconZr(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
14.10.2HafnonHfSiO4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
14.10.5VlasoviteNa2ZrSi4O11Mon. 2/m : B2/b
14.10.6Keldyshite(Na,H)2ZrSi2O7Tric. 1 : P1
14.10.7GaidonnayiteNa2Zr(Si3O9) · 2H2OOrth. mmm (2/m 2/m 2/m) : Pmna
14.10.8TerskiteNa4ZrSi6O16 · 2H2OOrth.
14.10.9ElpiditeNa2ZrSi6O15 · 3H2OOrth.
14.10.10HilairiteNa2Zr[SiO3]3 · 3H2OTrig.
14.10.11PetarasiteNa5Zr2(Si6O18)(Cl,OH) · 2H2OMon. 2/m : P21/m
14.10.15KostyleviteK2Zr(Si3O9) · H2OMon.
14.10.16UmbiteK2(Zr,Ti)Si3O9 · H2OOrth.
14.10.17ParaumbiteK3Zr2H(Si3O9)2 · nH2OOrth.
14.10.18GeorgechaoiteNaKZr[Si3O9] · 2H2OOrth. mm2
14.10.20CalciocatapleiiteCaZr(Si3O9) · 2H2OOrth.
14.10.21CalciohilairiteCaZr[SiO3]3 · 3H2OTrig.
14.10.22ArmstrongiteCaZr[Si6O15] · 3H2OMon.
14.10.23Lemoynite(Na,K)2CaZr2Si10O26 · 5H2OMon. 2/m : B2/b
14.10.24CatapleiiteNa2Zr(Si3O9) · 2H2OMon.
14.10.25BaghdaditeCa6Zr2(Si2O7)2O4Mon. 2/m : P21/b
14.10.26LovozeriteNa2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2OMon.
14.10.27Låvenite(Na,Ca)2(Mn2+,Fe2+)(Zr,Ti)(Si2O7)(O,OH,F)2Mon. 2/m : P21/b
14.10.29DarapiositeKNa2Mn2(Li2ZnSi12)O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
14.10.31KomkoviteBaZr[Si3O9] · 3H2OTrig.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for PenkvilksiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bussen, I.V., Men'shikov, Yu.P., Merkov, A.M., Nedorezova, A.P., Uspenskaya, E.I., Khomyakov, A.P. (1974) Penkvilksite, a new hydrous silicate of titanium and sodium.Doklady Akademii Nauk SSSR: 217: 1161-1164 (in Russian). English translation: Doklady Akademii Nauk SSSR. Earth Sciences Section: 217: 126-129.
Fleischer, M. (1975) New mineral names. American Mineralogist: 60: 340-341.
Merlino S., Pasero M., Artioli G., Khomyakov A.P. (1994) Penkvilksite, a new kind of silicate structure: OD character, X-ray single crystal (1M) and powder Rietveld (2O) refinements of two MDO polytypes. American Mineralogist: 79: 1185-1193.
Subbotin, V.V., et al. (2000) Tumchaite - a new mineral from carbonatites of the Vuoriyarvi alkali-ultrabasic massif, Murmansk Region, Russia. American Mineralogist: 85: 1516-1520.
Sherriff, B.L., Zhou, B. (2004) 29Si and 23Na MAS NMR spectroscopic study of the polytypes of the titanosilicate penkvilksite. The Canadian Mineralogist: 42: 1027-1035.
Cadoni, M., Ferraris, G. (2008) Penkvilskite-2O: Na2TiSi4O11·2H2O. Acta Crystallographica: C64: i87-i90.

Internet Links for PenkvilksiteHide

Localities for PenkvilksiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359.
  • Murmansk Oblast
    • Khibiny Massif
YAKOVENCHUK, V.N., IVANYUK, G.YU., PAKHOMOVSKY, YA.A. & MEN’SHIKOV, YU.P. (2005): Khibiny. Published by Laplandia Minerals, Apatity. [penkvilksite-1M] p. 293.
Mikhailova, J. A., Kalashnikov, A. O., Sokharev, V. A., Pakhomovsky, Y. A., Konopleva, N. G., Yakovenchuk, V. N., ... & Ivanyuk, G. Y. (2016). 3D mineralogical mapping of the Kovdor phoscorite–carbonatite complex (Russia). Mineralium Deposita, 51(1), 131-149.
    • Lovozersky District
      • Karnasurt Mountain
Bussen, I.V., Men'shikov, Yu.P., Merkov, A.M., Nedorezova, A.P., Uspenskaya, E.I., Khomyakov, A.P. (1974) Penkvilksite, a new hydrous silicate of titanium and sodium.Doklady Akademii Nauk SSSR: 217: 1161-1164 (in Russian). English translation: Doklady Akademii Nauk SSSR. Earth Sciences Section: 217: 126-129.; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; Zubkova, N. V., Pekov, I. V., Pushcharovsky, D. Y., & Chukanov, N. V. (2009). The crystal structure and refined formula of mountainite, KNa2Ca2 [Si8O19 (OH)]⊙ 6 H2O. Zeitschrift für Kristallographie, 224(8), 389-396.; Pluth, J. J., Smith, J. V., Pushcharovsky, D. Y., Semenov, E. I., Bram, A., Riekel, C., ... & Broach, R. W. (1997). Third-generation synchrotron x-ray diffraction of 6-μm crystal of raite,≈ Na3Mn3Ti0. 25Si8O20 (OH) 2⋅ 10H2O, opens up new chemistry and physics of low-temperature minerals. Proceedings of the National Academy of Sciences, 94(23), 12263-12267.; Pekov, I.V. (2000): Lovozero Massif. Moscow, Ocean Pictures Ltd, 480 pp.
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