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Senkevichite

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Formula:
CsKNaCa2Ti[O|Si7O18(OH)]
Colour:
Colorless
Lustre:
Vitreous
Hardness:
5½ - 6
Specific Gravity:
3.12
Crystal System:
Triclinic
Name:
Named by Atali A. Agakhanov, Leonid A. Pautov, Yulia A. Uvarova, Elena, V. Sokolova, Franck C. Hawthorne, Vladimir Yu. Karpenko in 2005 in honor of Yurii Alekseevich Senkevich (4 March 1937, Choibalsan, Mongolia – 25 September 2003, Moscow, Russia) (alternate spellings, Yuri Aleksandrovich Senkevich, Юрий Александрович Сенкевич), "outstanding Russian traveller, medical officer, researcher of the behavior of the human organism in extreme conditions, famous TV reporter and journalist."
Isostructural with:
Cs analogue of Tinaksite


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Classification of SenkevichiteHide

Approved
Approval Year:
2004
9.DG.75

9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains

Physical Properties of SenkevichiteHide

Vitreous
Transparency:
Transparent
Colour:
Colorless
Hardness:
5½ - 6 on Mohs scale
Hardness:
VHN100=611 - 708 kg/mm2 - Vickers
Tenacity:
Brittle
Density:
3.12(2) g/cm3 (Measured)    3.13 g/cm3 (Calculated)

Optical Data of SenkevichiteHide

Type:
Biaxial (+)
RI values:
nα = 1.616(2) nβ = 1.645(2) nγ = 1.638(2)
2V:
Measured: 85° (2), Calculated: 84°
Max Birefringence:
δ = 0.022
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
Strong r < v

Chemical Properties of SenkevichiteHide

Formula:
CsKNaCa2Ti[O|Si7O18(OH)]
IMA Formula:
CsKNaCa2TiOSi7O18(OH)

Crystallography of SenkevichiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 10.4191 Å, b = 12.2408 Å, c = 7.0569 Å
α = 90.857°, β = 99.193°, γ = 91.895°
Ratio:
a:b:c = 0.851 : 1 : 0.577
Unit Cell V:
887.8 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.08(13)
3.33(11)
3.25(16)
3.14(21)
3.06(100)
2.959(20)
2.038(17)
Comments:
From type description.

Type Occurrence of SenkevichiteHide

Synonyms of SenkevichiteHide

Other Language Names for SenkevichiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Leucosphenite1 photo of Senkevichite associated with Leucosphenite on mindat.org.
Fluorite1 photo of Senkevichite associated with Fluorite on mindat.org.
Polylithionite1 photo of Senkevichite associated with Polylithionite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.DG.05BustamiteCaMn2+(Si2O6)Tric. 1 : P1
9.DG.05FerrobustamiteCaFe2+(Si2O6)Tric.
9.DG.05PectoliteNaCa2Si3O8(OH)Tric. 1 : P1
9.DG.05SeranditeNaMn2+2Si3O8(OH)Tric. 1 : P1
9.DG.05WollastoniteCaSiO3Tric. 1 : P1
9.DG.05Wollastonite-1ACaSiO3Tric.
9.DG.07CascanditeCa(Sc,Fe3+)(HSi3O9)Tric.
9.DG.08Plombièrite[Ca4Si6O16(OH)2 · 2H2O]·(Ca·5H2O)Orth.
9.DG.10Clinotobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)Mon.
9.DG.10RiversideiteCa5(HSi3O9)2 · 2H2OOrth.
9.DG.10Tobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)Orth.
9.DG.15FoshagiteCa4(Si3O9)(OH)2Tric.
9.DG.20JenniteCa9(Si3O9)2(OH)8 · 8H2OTric.
9.DG.25ParaumbiteK3Zr2H(Si3O9)2 · nH2OOrth.
9.DG.25UmbiteK2(Zr,Ti)Si3O9 · H2OOrth.
9.DG.30SørenseniteNa4SnBe2Si6O16(OH)4Mon. 2/m : B2/b
9.DG.35XonotliteCa6(Si6O17)(OH)2Mon. 2/m
9.DG.40HillebranditeCa2(SiO3)(OH)2Orth. mmm (2/m 2/m 2/m) : Cmcm
9.DG.45ZoriteNa8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2OOrth.
9.DG.45ChivruaiiteCa4(Ti,Nb)5(Si6O17)2(OH,O)5 · 13-14H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
9.DG.50Haineaultite(Na,Ca)5Ca(Ti,Nb)5(Si6O17)2(OH,F)8 · 5H2OOrth. 2 2 2 : C2 2 2
9.DG.55EpididymiteNa2Be2Si6O15 · H2OOrth. mmm (2/m 2/m 2/m) : Pnma
9.DG.60EudidymiteNa2Be2Si6O15 · H2OMon. 2/m : B2/b
9.DG.65ElpiditeNa2ZrSi6O15 · 3H2OOrth.
9.DG.70Fenaksite(K,Na)4(Fe,Mn)2(Si4O10)2(OH,F)Tric.
9.DG.70LitidioniteCuNaKSi4O10Tric.
9.DG.70ManaksiteKNaMnSi4O10Tric.
9.DG.75TinaksiteK2Na(Ca,Mn2+)2Ti[O|Si7O18(OH)]Tric.
9.DG.75TokkoiteK2Ca4[Si7O18(OH)](OH,F)Tric.
9.DG.80CanasiteK3Na3Ca5Si12O30(OH)4
9.DG.80FluorcanasiteK3Na3Ca5Si12O30F4 · H2OMon. m : Bm
9.DG.85MiseriteK1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2OTric.
9.DG.90FrankameniteK3Na3Ca5(Si12O30)(F,OH)4 · H2OTric.
9.DG.92Charoite(K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4 · ~3H2OMon. 2/m : P21/m
9.DG.95YuksporiteK4(Ca,Na)14(Sr,Ba)2(◻,Mn,Fe)(Ti,Nb)4(O,OH)4(Si6O17)2(Si2O7)3(H2O,OH)3Orth.
9.DG.97Eveslogite(Na,K,Ca,Sr,Ba)48 [(Ti,Nb,Mn,Fe2+)12Si48O144(OH)12](F,OH,Cl)14Mon. 2/m : P2/m

Other InformationHide

Notes:
Insoluble in water or HCl
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 SenkevichiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Agakhanov, A.A., Pautov, L.A., Uvarova, Y.A., Sokolova, E.V., Hawthorne, F.C., Karpenko, V.Yu. (2005) Senkevichite, CsKNaCa2TiO[Si7O18(OH)], a new mineral. New Data on Minerals: 40: 17-22.
Uvarova, Yu.A., Sokolova, E., Hawthorne, F.C., Agakhanov, A.A., Pautov, L.A., Karpenko, V.Yu. (2006) The crystal chemistry of senkevichite, CsKNaCa2TiO[Si7O18(OH)], from the Dara-i-Poiz alkaline massif, northern Tajikistan. Canadian Mineralogist: 44: 1341-1348.
Pekov, I.V. (2007) New minerals from former Soviet Union countries, 1998-2006: new minerals approved by the IMA commission on new minerals and mineral names. Mineralogical Almanac: 11: 9-51.

Internet Links for SenkevichiteHide

Localities for SenkevichiteHide

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.
Tajikistan (TL)
 
  • Region of Republican Subordination
    • Tien Shan Mtn
      • Alai Range (Alayskiy)
Agakhanov, A.A., Pautov, L.A., Uvarova, Y.A., Sokolova, E.V., Hawthorne, F.C., Karpenko, V.Yu. (2005): Senkevichite, CsKNaCa2TiO[Si7O18(OH)], a new mineral. New Data on Minerals, 40, 11-16; Agakhanov, A.A., Pautov, L.A., Sokolova, E., Hawthorne, F.C., Karpenko, V.Yu., Siidra, O.I., Muftakhov, V.A. (2016): Odigitriaite, CsNa5Ca5[Si14B2O38]F2, a new cesium borosilicate mineral from the Darai-Pioz alkaline massif, Tajikistan: Description and crystal structure. Mineralogical Magazine, 80, (in press).
Mineral and/or Locality  
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