Senkevichite
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About Senkevichite
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."
Type Locality:
Classification of Senkevichite
Approved
Approval Year:
2004
8/F.22-40
9.DG.75
9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
Physical Properties of Senkevichite
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 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.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
Strong r < v
Chemical Properties of Senkevichite
Formula:
CsKNaCa2Ti[O|Si7O18(OH)]
IMA Formula:
CsNaKCa2TiOSi7O18(OH)
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°
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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
Synonyms of Senkevichite
Common Associates
Associated Minerals Based on Photo Data:
| Leucosphenite | 1 photo of Senkevichite associated with Leucosphenite on mindat.org. |
| Fluorite | 1 photo of Senkevichite associated with Fluorite on mindat.org. |
| Polylithionite | 1 photo of Senkevichite associated with Polylithionite on mindat.org. |
Related Minerals - Nickel-Strunz Grouping
| 9.DG.05 | Bustamite | CaMn2+(Si2O6) | Tric. 1 : P1 |
| 9.DG.05 | Ferrobustamite | CaFe2+(Si2O6) | Tric. |
| 9.DG.05 | Pectolite | NaCa2Si3O8(OH) | Tric. 1 : P1 |
| 9.DG.05 | Serandite | NaMn2+2Si3O8(OH) | Tric. 1 : P1 |
| 9.DG.05 | Wollastonite | CaSiO3 | Tric. 1 : P1 |
| 9.DG.05 | Wollastonite-1A | CaSiO3 | Tric. |
| 9.DG.07 | Cascandite | Ca(Sc,Fe3+)(HSi3O9) | Tric. 1 |
| 9.DG.08 | Plombièrite | [Ca4Si6O16(OH)2 · 2H2O]·(Ca·5H2O) | Orth. |
| 9.DG.10 | Clinotobermorite | [Ca4Si6O17 · 2H2O]·(Ca·3H2O) | Mon. |
| 9.DG.10 | Riversideite | Ca5(HSi3O9)2 · 2H2O | Orth. |
| 9.DG.10 | Tobermorite | [Ca4Si6O17 · 2H2O]·(Ca·3H2O) | Orth. |
| 9.DG.15 | Foshagite | Ca4(Si3O9)(OH)2 | Tric. |
| 9.DG.20 | Jennite | Ca9(Si3O9)2(OH)8 · 8H2O | Tric. |
| 9.DG.25 | Paraumbite | K3Zr2H(Si3O9)2 · nH2O | Orth. |
| 9.DG.25 | Umbite | K2(Zr,Ti)Si3O9 · H2O | Orth. |
| 9.DG.30 | Sørensenite | Na4SnBe2Si6O16(OH)4 | Mon. 2/m : B2/b |
| 9.DG.35 | Xonotlite | Ca6(Si6O17)(OH)2 | Mon. 2/m |
| 9.DG.40 | Hillebrandite | Ca2(SiO3)(OH)2 | Orth. mmm (2/m 2/m 2/m) : Cmcm |
| 9.DG.45 | Zorite | Na8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2O | Orth. |
| 9.DG.45 | Chivruaiite | Ca4(Ti,Nb)5(Si6O17)2(OH,O)5 · 13-14H2O | Orth. mmm (2/m 2/m 2/m) : Cmmm |
| 9.DG.50 | Haineaultite | (Na,Ca)5Ca(Ti,Nb)5(Si6O17)2(OH,F)8 · 5H2O | Orth. 2 2 2 : C2 2 2 |
| 9.DG.55 | Epididymite | Na2Be2Si6O15 · H2O | Orth. mmm (2/m 2/m 2/m) : Pnma |
| 9.DG.60 | Eudidymite | Na2Be2Si6O15 · H2O | Mon. 2/m : B2/b |
| 9.DG.65 | Elpidite | Na2ZrSi6O15 · 3H2O | Orth. |
| 9.DG.70 | Fenaksite | (K,Na)4(Fe,Mn)2(Si4O10)2(OH,F) | Tric. |
| 9.DG.70 | Litidionite | CuNaKSi4O10 | Tric. |
| 9.DG.70 | Manaksite | KNaMnSi4O10 | Tric. |
| 9.DG.75 | Tinaksite | K2Na(Ca,Mn2+)2Ti[O|Si7O18(OH)] | Tric. |
| 9.DG.75 | Tokkoite | K2Ca4[Si7O18(OH)](OH,F) | Tric. |
| 9.DG.80 | Canasite | K3Na3Ca5Si12O30(OH)4 | |
| 9.DG.80 | Fluorcanasite | K3Na3Ca5Si12O30F4 · H2O | Mon. m : Bm |
| 9.DG.85 | Miserite | K1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2O | Tric. |
| 9.DG.90 | Frankamenite | K3Na3Ca5(Si12O30)(F,OH)4 · H2O | Tric. |
| 9.DG.92 | Charoite | (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 · ~3H2O | Mon. 2/m : P21/m |
| 9.DG.95 | Yuksporite | K4(Ca,Na)14(Sr,Ba)2(◻,Mn,Fe)(Ti,Nb)4(O,OH)4(Si6O17)2(Si2O7)3(H2O,OH)3 | Orth. |
| 9.DG.97 | Eveslogite | (Na,K,Ca,Sr,Ba)48 [(Ti,Nb,Mn,Fe2+)12Si48O144(OH)12](F,OH,Cl)14 | Mon. 2/m : P2/m |
Other Information
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 Senkevichite
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 Senkevichite
mindat.org URL:
https://www.mindat.org/min-27468.html
Please feel free to link to this page.
Please feel free to link to this page.
External Links:
Mineral Dealers:
Localities for Senkevichite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Tajikistan (TL) | |
| 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). |
Dara-i-Pioz Glacier, Alai Range, Tien Shan Mtn, Region of Republican Subordination, Tajikistan