Tsepinite-Na Mineral Data

Tsepinite-Na Mineral Data

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General Tsepinite-Na Information

Chemical Formula:

(Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2·3(H2O)

Composition:

Molecular Weight = 2,397.82 gm

Potassium 1.30 % K 1.57 % K₂O

Barium 2.29 % Ba 2.56 % BaO

Sodium 4.03 % Na 5.43 % Na₂O

Strontium 1.83 % Sr 2.16 % SrO

Calcium 0.17 % Ca 0.23 % CaO

Titanium 8.39 % Ti 13.99 % TiO₂

Niobium 14.34 % Nb 20.51 % Nb₂O₅

Iron 0.23 % Fe 0.33 % Fe₂O₃

Silicon 18.74 % Si 40.09 % SiO₂

Hydrogen 1.45 % H 12.92 % H₂O

Oxygen 47.24 % O

______ ______

100.00 % 99.80 % = TOTAL OXIDE

Empirical Formula:

H_34.4Na_4.2K_0.8Sr_0.5Ba_0.4Ca_0.1Ti_4.2Nb_3.7Fe³⁺_0.1Si₁₆O_70.8

Environment:

Alkaline rocks. Labuntsovite group; structure

IMA Status:

Approved IMA 2000 (Dana # Added)

Locality:

Khibinpaschchorr, Khibiny alkaline complex, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Anatoliy I. Tsepin (1946-), Russian microprobe analyst.

Synonym:

IMA2000-046

Tsepinite-Na Image

Images:

Tsepinite-Na

Comments: Brown, needle-like crystals of tsepinite-Na in matrix.
Location: Lephke-Nelm, Lovozero, Kola, Russia. Scale: Crystal size 3 mm.
© Tom Loomis / Dakota Matrix

Tsepinite-Na Crystallography

Axial Ratios:

a:b:c =1.0231:1:0.5557

Cell Dimensions:

a = 14.604, b = 14.274, c = 7.933, Z = 1; beta = 117.4° V = 1,468.17 Den(Calc)= 2.71

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Cm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 7.09(1)(020,001), 3.24(0.9)(421,400,402), 3.15(0.8)(041,022,241), 2.54(0.7)(441,401,403), 2.06(0.6)(441,443), 2.63(0.6)(242

Physical Properties of Tsepinite-Na

Cleavage:

None

Color:

Colorless, White, Light brown.

Density:

2.74

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Tsepinite-Na

Gladstone-Dale:

CI meas= 0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.258,KPDmeas= 0.2552,KC= 0.2586

Optical Data:

Biaxial (+), a=1.658-1.661, b=1.668, g=1.77, bire=0.1090-0.1120

Calculated Properties of Tsepinite-Na

Electron Density:

r_electron=2.66 gm/cc
note: r_Tsepinite-Na=2.71 gm/cc.

Fermion Index

Fermion Index = 0.02523
Boson Index = 0.97477

Photoelectric:

PE_Tsepinite-Na= 34.41 barns/electron
U=PE_Tsepinite-Na x r_electron= 91.49 barns/cc.

Radioactivity:

GRapi = 18.45 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Tsepinite-Na - barely detectable

Tsepinite-Na Classification

Dana Class:

60.1.3b.2 (60)Cyclosilicate Four-Membered Rings

(60.1)as Titanosilicates

(60.1.3b)Labuntsovite Group (Vuoriyarvite subgroup Monoclinic [Cm])

60.1.3b.1 Vuoriyarvite-K! (K,Na)2(Nb,Ti)2Si4O12(O,OH)2·4(H2O) Cm m

60.1.3b.2 Tsepinite-Na ! (Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2·3(H2O) Cm m

60.1.3b.3 Tsepinite-K! (K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2·3(H2O) Cm m

60.1.3b.4 Tsepinite-Ca! (Ca,K,Na,[])2(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m

60.1.3b.5 Paratsepinite-Ba! (Ba,Na,K)2-x(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m

Strunz Class:

VIII/E.07-30 VIII - Silicates

VIII/E - Cyklosilicates, quadruplet rings [Si4O11]8-

VIII/E.07 - Labuntsovite Group

VIII/E.07-10 Korobitsynite! Na3(Ti,Nb)2[Si4O12](OH,O)2·3-4(H2O) Pbam 2/m 2/m 2/m

VIII/E.07-20 Nenadkevichite (Na,Ca,K)(Nb,Ti)Si2O6(O,OH)·2(H2O) Pbam 2/m 2/m 2/m

VIII/E.07-30* Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m

VIII/E.07-30 Tsepinite-Na (Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2·3(H2O) Cm m

VIII/E.07-32 Tsepinite-K! (K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2·3(H2O) Cm m

VIII/E.07-33 Tsepinite-Ca! (Ca,K,Na,[])2(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m

VIII/E.07-34 Paratsepinite-Ba! (Ba,Na,K)2-x(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m

VIII/E.07-40 Vuoriyarvite-K! (K,Na)2(Nb,Ti)2Si4O12(O,OH)2·4(H2O) Cm m

VIII/E.07-50 Clinophosinaite! Na3CaPSiO7 P 2/c 2/m

VIII/E.07-50* Kuzmenkoite-Zn! K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4·6-8(H2O) Cm m

VIII/E.07-60* Kuzmenkoite-Mn! (K,Na)2(Mn,Fe)(Ti,Nb)4[Si4O12]2(OH)4·5(H2O) C 2/m 2/m

VIII/E.07-60 Phosinaite-(Ce)! Na13Ca2Ce[Si4O12](PO4)4 P 22121 2 2 2

VIII/E.07-70 Gjerdingenite-Fe! K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]·4(H2O) C 2/m 2/m

VIII/E.07-80 Gjerdingenite-Mn! (K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) C 2/m 2/m

VIII/E.07-90 Karupmollerite-Ca! (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4·7(H2O) C 2/m 2/m

VIII/E.07-100 Lemmleinite-K! NaK2(Ti,Nb)2Si4O12(O,OH)2·2(H2O) C 2/m 2/m

VIII/E.07-110 Lemmleinite-Ba! Na2K2Ba1-xTi4(Si4O12)2(O,OH)4·5(H2O) C 2/m 2/m

VIII/E.07-130 Paralabuntsovite-Mg! Na8K8Mg8Ti16(Si4O12)8(O,OH)16·n(H2O) I2/m 2/m

VIII/E.07-140 Labuntsovite-Mg! Na4K4(Ba,K)(Mg,Fe)1xTi8(Si4O12)4(O,OH)8·10(H2O) C 2/m 2/m

VIII/E.07-150 Labuntsovite-Fe! Na4K4(Ba,K)2(Fe,Mg,Mn)1xTi8(Si4O12)4(O,OH)8·10(H2O) C 2/m 2/m

VIII/E.07-155 Labuntsovite-Mn Na4K4(Ba,K)(Mn,Fe)1x(Ti,Nb)8[Si4O12]4(O,OH)8·n(H2O),n=10-12 I2/m 2/m

VIII/E.07-170 Parakuzmenkoite-Fe! (K,Ba)2Fe(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) C 2/m 2/m

VIII/E.07-180 Organovaite-Zn! K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) C 2/m 2/m

VIII/E.07-190 Organovaite-Mn! K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) Cm m

VIII/E.07-200 Gutkovaite-Mn! CaK2Mn(Ti,Nb)4(Si4O12)2(O,OH)4·5(H2O) Cm m

VIII/E.07-205 Neskevaaraite-Fe! NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4·6(H2O) Cm m

VIII/E.07-210 Alsakharovite-Zn! NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) Cm m

VIII/E.07-220 Lepkhenelmite-Zn! Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) Cm m

Other Tsepinite-Na Information

References:

NAME( AmMin, v 87, p 1734) PHYS. PROP.(AmMin, v 87, p 1734) OPTIC PROP.(AmMin, v 87, p 1734)

See Also:

Links to other databases for Tsepinite-Na :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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Print or Cut-and-Paste your Tsepinite-Na Specimen Label here :

Tsepinite-Na

(Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2·3(H2O)
Dana No: 60.1.3b.2 Strunz No: VIII/E.07-30
Locality:

Notes: