Tsepinite-K Mineral Data

Tsepinite-K Mineral Data

General Tsepinite-K Information

Chemical Formula:

(K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2·3(H2O)

Composition:

Molecular Weight = 614.51 gm

Potassium 5.47 % K 6.59 % K₂O

Barium 10.28 % Ba 11.48 % BaO

Sodium 1.61 % Na 2.17 % Na₂O

Titanium 12.93 % Ti 21.58 % TiO₂

Manganese 0.89 % Mn 1.15 % MnO

Niobium 4.99 % Nb 7.14 % Nb₂O₅

Iron 0.27 % Fe 0.39 % Fe₂O₃

Silicon 18.28 % Si 39.11 % SiO₂

Hydrogen 1.16 % H 10.39 % H₂O

Oxygen 44.11 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K_0.86Ba_0.46Na_0.43Mn²⁺_0.1Ti_1.66Nb_0.33Si₄O₁₂(OH)_1.21O_0.79·2.94(H₂O)

Environment:

Alkaline pegmatites as pseudomorphs after murmanite. Labuntsovite group; structure determined.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Mt. Karnasurt, Lovozero alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named as the K-dominant analog of tsepinite-Na.

Synonym:

IMA2002-005

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Tsepinite-K Crystallography

Axial Ratios:

a:b:c =1.038:1:0.5639

Cell Dimensions:

a = 14.327, b = 13.802, c = 7.783, Z = 4; beta = 116.95° V = 1,371.89 Den(Calc)= 2.98

Crystal System:

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

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

By Intensity(I/I_o): 6.87(1)(001,020), 2.56(0.9)(203,331), 3.05(0.8)(022,041),3(0.6)(240,241), 3.2(0.6)(400), 3.95(0.5), 4.85(0.5),

Crystal Structure:

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Rosenberg K A , Rastsvetaeva R K , Pekov I V , Chukanov N V , Verin I A , Doklady Akademii Nauk SSSR , 393 (2003) p.784-787, Crystal structure of Sr-rich tsepinite

Physical Properties of Tsepinite-K

Cleavage:

[???] Imperfect

Color:

Light brown, White, Colorless.

Density:

2.88

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

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

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Optical Properties of Tsepinite-K

Gladstone-Dale:

CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2451,KPDmeas= 0.2536,KC= 0.2558

Optical Data:

Biaxial (+), a=1.69, b=1.701, g=1.8, bire=0.1100

Calculated Properties of Tsepinite-K

Electron Density:

r_electron=2.80 gm/cc
note: r_Tsepinite-K=2.88 gm/cc.

Fermion Index

Fermion Index = 0.04385
Boson Index = 0.95615

Photoelectric:

PE_Tsepinite-K= 53.39 barns/electron
U=PE_Tsepinite-K x r_electron= 149.53 barns/cc.

Radioactivity:

GRapi = 76.77 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Tsepinite-K - barely detectable

Tsepinite-K Classification

Dana Class:

60.1.3b.3 (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.07-32 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-K Information

References:

NAME( AmMin, v 89, p 895) PHYS. PROP.(AmMin, v 89, p 895) OPTIC PROP.(AmMin, v 89, p 895)

See Also:

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

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

Tsepinite-K

(K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2·3(H2O)
Dana No: 60.1.3b.3 Strunz No: VIII/E.07-32
Locality:

Notes: