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⇱ Senkevichite: Mineral information, data and localities.

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Senkevichite

A valid IMA mineral species
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About SenkevichiteHide

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Formula:
CsKNaCa2TiO[Si7O18](OH)
Colour:
Colorless, white
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


Unique IdentifiersHide

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Mindat ID:
27468
Long-form identifier:
mindat:1:1:27468:3

IMA Classification of SenkevichiteHide

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Approved
IMA Formula:
CsNaKCa2TiOSi7O18(OH)
Approval year:
2004
First published:
2005

Classification of SenkevichiteHide

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9.DG.75

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

Mineral SymbolsHide

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

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

Physical Properties of SenkevichiteHide

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Vitreous
Transparency:
Transparent
Colour:
Colorless, white
Streak:
White
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

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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
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.

Surface Relief:
Moderate
Dispersion:
Strong r < v

Chemistry of SenkevichiteHide

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Mindat Formula:
CsKNaCa2TiO[Si7O18](OH)
Element Weights:
Element% weight
O38.066 %
Si23.388 %
Cs15.811 %
Ca9.535 %
Ti5.694 %
K4.651 %
Na2.735 %
H0.120 %

Calculated from ideal end-member formula.

Crystallography of SenkevichiteHide

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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

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0006127SenkevichiteUvarova Y A, Sokolova E, Hawthorne F C, Agakhanov A A, Pautov L A, Karpenko V Y (2006) The crystal chemistry of senkevichite, CsKNaCa2TiO[Si7O18(OH)], from the Dara-I-Pioz alkaline massif, northern Tajikistan The Canadian Mineralogist 44 1341-1348👁 Image
2006Dara-i-Pioz moraine, Alai ridge, Tien-Shan Mountains, Tajikistan0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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

Geological EnvironmentHide

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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 SenkevichiteHide

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General Appearance of Type Material:
Intergrowths of elongated board-like grains up to 1 mm in light in quartz-pectolite aggregates.
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, RAS, Moscow, Russia (92107).
Geological Setting of Type Material:
Alkaline massif.
Associated Minerals at Type Locality:

Synonyms of SenkevichiteHide

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Other Language Names for SenkevichiteHide

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Common AssociatesHide

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Associations Based on Photo Data:
1 photo of Senkevichite associated with LeucospheniteBaNa4Ti2B2Si10O30
1 photo of Senkevichite associated with FluoriteCaF2
1 photo of Senkevichite associated with PolylithioniteKLi2Al(Si4O10)(F,OH)2

Related Minerals - Strunz-mindat GroupingHide

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9.DG.Barrydawsonite-(Y)Na1.5Y0.5CaSi3O8(OH)Mon. 2/m : P21/b
9.DG.ParatobermoriteCa5AlSi5O16(OH) · 5H2OMon. 2/m
9.DG.CalcinaksiteKNaCa(Si4O10) · H2OTric. 1 : P1
9.DG.AlvesiteNaKZrSi6O15 · 2H2OOrth. mmm(2/m2/m2/m)
9.DG.02SteedeiteNaMn2[Si3BO9](OH)2Tric. 1 : P1
9.DG.02NolzeiteNaMn2[Si3BO9](OH)2 · 2H2OTric. 1 : P1
9.DG.05MurakamiiteLiCa2Si3O8(OH)Tric. 1 : P1
9.DG.05SeranditeNaMn2+2Si3O8(OH)Tric. 1 : P1
9.DG.05BustamiteCaMn2+(Si2O6)Tric. 1 : P1
9.DG.05PectoliteNaCa2Si3O8(OH)Tric. 1 : P1
9.DG.05TanohataiteLiMn2Si3O8(OH)Tric. 1 : P1
9.DG.05DalnegorskiteCa5Mn(Si3O9)2Tric. 1 : P1
9.DG.05'Wollastonite-1A'CaSiO3Tric. 1 : P1
9.DG.05WollastoniteCa3(Si3O9)Tric. 1 : P1
9.DG.05FerrobustamiteCaFe2+(Si2O6)Tric. 1
9.DG.05SchizoliteNaCaMnSi3O8(OH)Tric. 1 : P1
9.DG.07CascanditeCaScSi3O8(OH)Tric. 1
9.DG.08PlombièriteCa5Si6O16(OH)2 · 7H2OOrth.
9.DG.10ClinotobermoriteCa5Si6O17 · 5H2OMon.
9.DG.10RiversideiteCa5Si6O16(OH)2 · 2H2O Orth.
9.DG.10TobermoriteCa5Si6O17 · 5H2OMon. 2 : P21
9.DG.12JusiteNa2Ca15Al4Si16O54 · 17H2O
9.DG.12KenotobermoriteCa4Si6O15(OH)2 · 5H2OMon.
9.DG.15FoshagiteCa4(Si3O9)(OH)2Tric. 1 : P1
9.DG.20JenniteCa9(Si3O9)2(OH)8 · 8H2OTric. 1 : P1
9.DG.20KameneviteK2TiSi3O9 · H2OOrth. 222 : P212121
9.DG.25ParaumbiteK3Zr2H(Si3O9)2 · nH2OOrth. mm2
9.DG.25UmbiteK2(Zr,Ti)Si3O9 · H2OOrth. 222 : P212121
9.DG.30SørenseniteNa4SnBe2Si6O16(OH)4Mon. 2/m : B2/b
9.DG.32Escheite Ca2NaMnTi5[Si12O34]O2(OH)3 · 12H2OOrth. mm2 : Ama2
9.DG.35XonotliteCa6(Si6O17)(OH)2Mon. 2/m : B2/m
9.DG.40HillebranditeCa2(SiO3)(OH)2Orth. mmm(2/m2/m2/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/m2/m2/m) : Cmmm
9.DG.50Haineaultite(Na,Ca)5Ca(Ti,Nb)5(Si6O17)2(OH,F)8 · 5H2OOrth. 222 : C222
9.DG.55EpididymiteNa2Be2Si6O15 · H2OOrth. mmm(2/m2/m2/m) : Pnma
9.DG.60EudidymiteNa2Be2Si6O15 · H2OMon. 2/m : B2/b
9.DG.65ElpiditeNa2ZrSi6O15 · 3H2OOrth.
9.DG.65PatyniteNaKCa4[Si9O23]Tric. 1 : P1
9.DG.67WhelaniteCu2+2Ca6[Si6O17(OH)](CO3)(OH)3 · 2H2OOrth. mm2 : Pnn2
9.DG.70EnricofrancoiteKNaCaSi4O10Tric. 1 : P1
9.DG.70YusupoviteNa2Zr(Si6O15) · 2.5H2OMon. 2/m : B2/m
9.DG.70LitidioniteKNaCuSi4O10Tric. 1 : P1
9.DG.70Fenaksite(K,Na)4(Fe,Mn)2(Si4O10)2(OH,F)Tric. 1 : P1
9.DG.70ManaksiteKNaMnSi4O10Tric. 1 : P1
9.DG.75TinaksiteK2Na(Ca,Mn2+)2TiO[Si7O18(OH)]Tric.
9.DG.75TokkoiteK2Ca4[Si7O18(OH)](OH,F)Tric.
9.DG.80FluorcanasiteK3Na3Ca5Si12O30F4 · H2OMon. m : Bm
9.DG.80CanasiteK3Na3Ca5Si12O30(OH)4Mon. 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. 1 : P1
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)3Mon. 2/m : P21/m
9.DG.97Eveslogite(Na,K,Ca,Sr,Ba)48 [(Ti,Nb,Mn,Fe2+)12Si48O144(OH)12](F,OH,Cl)14Mon. 2/m : P2/m

RadioactivityHide

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Radioactivity:
Element % Content Activity (Bq/kg) Radiation Type
Uranium (U) 0.0000% 0 α, β, γ
Thorium (Th) 0.0000% 0 α, β, γ
Potassium (K) 4.6512% 1,442 β, γ

For comparison:

  • Banana: ~15 Bq per fruit
  • Granite: 1,000–3,000 Bq/kg
  • EU exemption limit: 10,000 Bq/kg

Note: Risk is shown relative to daily recommended maximum exposure to non-background radiation of 1000 µSv/year. Note that natural background radiation averages around 2400 µSv/year so in reality these risks are probably extremely overstated! With infrequent handling and safe storage natural radioactive minerals do not usually pose much risk.

Interactive Simulator:

Note: The mass selector refers to the mass of radioactive mineral present, not the full specimen, also be aware that the matrix may also be radioactive, possibly more radioactive than this mineral!

Activity: –

DistanceDose rateRisk
1 cm
10 cm
1 m

The external dose rate (D) from a radioactive mineral is estimated by summing the gamma radiation contributions from its Uranium, Thorium, and Potassium content, disregarding daughter-product which may have a significant effect in some cases (eg 'pitchblende'). This involves multiplying the activity (A, in Bq) of each element by its specific gamma ray constant (Γ), which accounts for its unique gamma emissions. The total unshielded dose at 1 cm is then scaled by the square of the distance (r, in cm) and multiplied by a shielding factor (μshield). This calculation provides a 'worst-case' or 'maximum risk' estimate because it assumes the sample is a point source and entirely neglects any self-shielding where radiation is absorbed within the mineral itself, meaning actual doses will typically be lower. The resulting dose rate (D) is expressed in microsieverts per hour (μSv/h).

D = ((AU × ΓU) + (ATh × ΓTh) + (AK × ΓK)) / r2 × μshield

Other InformationHide

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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.

Internet Links for SenkevichiteHide

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

References for SenkevichiteHide

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Localities for SenkevichiteHide

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Showing 1 localities.

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

Locality ListHide

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👁 Image
- This locality has map coordinates listed. 👁 Image
- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 👁 Image
- Good crystals or important locality for species. 👁 Image
- 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.
Tajikistan (TL)
  • Districts of Republican Subordination
Agakhanov et al. (2005) +2 other references
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