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Senkevichite

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Formula:
CsKNaCa2TiOSi7O18(OH)
System:
Triclinic
Colour:
Colorless
Lustre:
Vitreous
Hardness:
5½ - 6
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


Classification of Senkevichite

Approved
Approval Year:
2004
9.DG.75

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

Physical Properties of Senkevichite

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

Optical Data of Senkevichite

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 Senkevichite

IMA Formula:
CsKNaCa2TiOSi7O18(OH)
Elements listed in formula:
Analytical Data:
Results from electron-microprobe analysis; water content calculated from crystal structure analysis
SiO2  (51.08)
TiO2   (8.94)
FeO    (0.50)
MnO    (2.59)
CaO   (10.98)
K2O    (6.13)
Na2O   (3.76)
Nb2O5  (0.64)
Cs2O  (15.28)
H2O    (1.09)

sum   100.99 wt.-%

Crystallography of Senkevichite

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 Volume:
V 887.8 ų
Z:
2
X-Ray 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 Senkevichite

Relationship of Senkevichite to other Species

9.DG.05BustamiteCaMn2+Si2O6
9.DG.05FerrobustamiteCaFe2+Si2O6
9.DG.05PectoliteNaCa2Si3O8(OH)
9.DG.05SeranditeNaMn22+Si3O8(OH)
9.DG.05WollastoniteCaSiO3
9.DG.05Wollastonite-1ACaSiO3
9.DG.07CascanditeCaScSi3O8(OH)
9.DG.08PlombièriteCa5Si6O16(OH)2 · 7H2O
9.DG.10ClinotobermoriteCa5Si6O17 · 5H2O
9.DG.10RiversideiteCa5Si6O16(OH)2 · 2H2O
9.DG.10TobermoriteCa5Si6O16(OH)2 · nH2O
9.DG.15FoshagiteCa4(SiO3)3(OH)2
9.DG.20JenniteCa9Si6O16(OH)10 · 6H2O
9.DG.25ParaumbiteK3Zr2H(Si3O9)2 · 3H2O
9.DG.25UmbiteK2ZrSi3O9 · H2O
9.DG.30SørenseniteNa4Be2Sn(Si3O9)2 · 2H2O
9.DG.35XonotliteCa6Si6O17(OH)2
9.DG.40HillebranditeCa2SiO3(OH)2
9.DG.45ZoriteNa6Ti5Si12O34(O,OH)5 · 11H2O
9.DG.45ChivruaiiteCa4(Ti,Nb)5(Si6O17)2(OH,O)5 · 13-14H2O
9.DG.50Haineaultite(Na,Ca)5Ca(Ti,Nb)5Si12O34(OH,F)8 · 5H2O
9.DG.55EpididymiteNa2Be2Si6O15 · H2O
9.DG.60EudidymiteNa2Be2Si6O15 · H2O
9.DG.65ElpiditeNa2ZrSi6O15 · 3H2O
9.DG.70FenaksiteKNaFe2+Si4O10
9.DG.70LitidioniteKNaCuSi4O10
9.DG.70ManaksiteKNaMn2+Si4O10
9.DG.75TinaksiteK2Na(Ca,Mn)2TiOSi7O18(OH)
9.DG.75TokkoiteK2Ca4Si7O18(OH)F
9.DG.80CanasiteK3Na3Ca5Si12O30(OH)4
9.DG.80FluorcanasiteK3Na3Ca5Si12O30F4 · H2O
9.DG.85MiseriteKCa6Si8O22(OH)
9.DG.90FrankameniteK3Na3Ca5Si12O30(F,OH)4 · H2O
9.DG.92Charoite(K,Sr,Ba,Mn)15-16(Ca,Na)32Si70(O,OH)180(OH,F)4 · nH2O
9.DG.95YuksporiteK4(Ca,Na)14(Sr,Ba)2(◻,Mn,Fe)(Ti,Nb)4(O,OH)4(Si6O17)2(Si2O7)3(H2O,OH)3
9.DG.97Eveslogite(Ca,K,Na,Sr,Ba)48(Ti,Nb,Fe,Mn)12(OH)12Si48O144(OH,F,Cl)14

Other Names for Senkevichite

Name in Other Languages:

Other Information

Other Information:
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 Senkevichite

Reference List:
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 Senkevichite

mindat.org URL:
https://www.mindat.org/min-27468.html
Please feel free to link to this page.

Localities for Senkevichite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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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