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Penkvilksite

A valid IMA mineral species
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About PenkvilksiteHide

Formula:
Na4Ti2Si8O22 · 4H2O
Colour:
White
Lustre:
Silky, Pearly, Dull
Hardness:
5
Specific Gravity:
2.58
Crystal System:
Orthorhombic
Name:
Named from the Lapp words "penk" and "vilkis", meaning "white" and "curly", because of its appearance.
This page provides mineralogical data about Penkvilksite.


Unique IdentifiersHide

Mindat ID:
3149
Long-form identifier:
mindat:1:1:3149:9
GUID
(UUID V4):
fbe6f6cf-01b2-43a4-bc40-798f443cf969

IMA Classification of PenkvilksiteHide

Classification of PenkvilksiteHide

9.EA.60

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
70.2.2.1

70 : INOSILICATES Column or Tube Structures
2 : Column or Tube Structures with Si2O7 dimers
14.10.28

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
PvlIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of PenkvilksiteHide

Silky, Pearly, Dull
Transparency:
Opaque
Colour:
White
Streak:
White
Hardness:
Density:
2.58 g/cm3 (Measured)    

Optical Data of PenkvilksiteHide

Type:
Biaxial (+)
RI values:
nα = 1.640 nβ = 1.646 nγ = 1.675
2V:
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:
Moderate
Dispersion:
relatively weak

Chemistry of PenkvilksiteHide

Mindat Formula:
Na4Ti2Si8O22 · 4H2O

Crystallography of PenkvilksiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbcn
Cell Parameters:
a = 16.3721(5) Å, b = 8.7492(3) Å, c = 7.4020(2) Å
Ratio:
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

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.2 Å(100)
3.37 Å(90)
2.84 Å(80)
3.32 Å(70)
3.10 Å(70)
3.07 Å(70)
1.713 Å(70)
3.42 Å(60)
2.674 Å(60)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of PenkvilksiteHide

General Appearance of Type Material:
White clotted masses to 3 cm.
Place of Conservation of Type Material:
Geology Museum, Kola Branch, Academy of Sciences, Apatity, Russia, 3244, 3781.
Mining Institute, St. Petersburg, Russia, 1065/1.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 75126.
National School of Mines, Paris, France.
The Natural History Museum, London, England, 1994,24.
Geological Setting of Type Material:
Alkaic massif, pegmatite, central natrolite zone.
Associated Minerals at Type Locality:
Reference:
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:
8 photos of Penkvilksite associated with RaiteNa4Mn2+3Ti0.25Si8O20(OH)2 · 10H2O
4 photos of Penkvilksite associated with ZoriteNa8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2O
2 photos of Penkvilksite associated with AegirineNaFe3+Si2O6
1 photo of Penkvilksite associated with TerskiteNa4ZrSi6O16 · 2H2O
1 photo of Penkvilksite associated with Labuntsovite-MnNa4K4(Ba,K)2Mn2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10-12H2O

Related Minerals - Strunz-mindat GroupingHide

9.EA.Bussyite-(Y)(Y,REE,Ca)3(Na,Ca)6MnSi9Be5(O,OH,F)34Mon. 2 : B2
9.EA.Fluorapophyllite-(NH₄)NH4Ca4(Si8O20)F · 8H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mnc
9.EA.Hydroxymcglassonite-(K)KSr4Si8O20(OH) · 8H2OTet.
9.EA.05CuprorivaiteCaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.05GillespiteBaFe2+Si4O10Tet. 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.05WesselsiteSrCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.07Fluorapophyllite-(Cs)CsCa4(Si8O20)F · 8H2OTet.
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. 4/mmm (4/m 2/m 2/m)
9.EA.15Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2OOrth.
9.EA.20MagadiiteNa2Si14O29 · 11H2OOrth. mm2 : Fdd2
9.EA.25DalyiteK2ZrSi6O15Tric. 1 : P1
9.EA.25DavaniteK2TiSi6O15Tric.
9.EA.30Sazhinite-(Ce)Na2CeSi6O14 · 6H2OOrth. mm2 : Pmm2
9.EA.30Sazhinite-(La)Na3La[Si6O15] · 2H2OOrth. mm2 : Pmm2
9.EA.35ArmstrongiteCaZr[Si6O15] · 3H2OMon. 2/m : B2/m
9.EA.40OkeniteCa10Si18O46 · 18H2OTric. 1 : P1
9.EA.45NekoiteCa3Si6O15 · 7H2OTric. 1 : P1
9.EA.45Perettiite-(Y)Y2Mn4FeSi2B8O24Orth. mmm (2/m 2/m 2/m) : Pmna
9.EA.45Badakhshanite-(Y)Y2Mn4Al(Si2B7BeO24)Orth. mmm (2/m 2/m 2/m) : Pnma
9.EA.47ShlykoviteKCa[Si4O9(OH)] · 3H2OMon. 2/m : P21/b
9.EA.50CavansiteCa(VO)Si4O10 · 4H2OOrth. mmm (2/m 2/m 2/m)
9.EA.50DiegogattaiteNa2CaCu2Si8O20 · H2OMon. 2/m : B2/m
9.EA.52YangitePbMnSi3O8 · H2OTric. 1 : P1
9.EA.55PentagoniteCa(VO)Si4O10 · 4H2OOrth. mm2
9.EA.60TumchaiteNa2Zr(Si4O11) · 2H2OMon. 2/m : P21/b
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

Other InformationHide

Thermal Behaviour:
DTA Endrothermic breaks at 220 C (dehydration) and 720 C (fusion).
TGA Gradual water loss 100-400 C.
Notes:
Slowly gels with cold 5% HCl or HNO3, or with warm H2SO4.
Fuses with a Bunsen burner to a dark brown glass.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for PenkvilksiteHide

References for PenkvilksiteHide

Reference List:

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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Canada
 
  • QuĂ©bec
    • MontĂ©rĂ©gie
      • La VallĂ©e-du-Richelieu RCM
        • Mont Saint-Hilaire
Russia
 
  • Murmansk Oblast
    • Khibiny Massif
    • Lovozersky District
      • Karnasurt Mountain
 
Mineral and/or Locality  
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