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_0.33Fe³⁺_0.03Si₄O₁₂(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

Tsepinite-K Image

Images:

Tsepinite-K

Comments: Light orange acicular crystals of tsepinite_K.
Location: Karnasurt Mt, Lovozero Massif, Kola Peninsula, Murmanskaya Oblast'; Northern Region,. Scale: See Image.
© Rruff Database

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

Diaphaneity:

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
Ncalc = 1.74 - 1.76

Optical Data:

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

Calculated Properties of Tsepinite-K

Electron Density:

Bulk Density (Electron Density)=2.80 gm/cc
note: Specific Gravity of Tsepinite-K =2.88 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

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)
Concentration of Tsepinite-K per GRapi unit = 1.30 (%)

Estimated Radioactivity from Tsepinite-K - barely detectable

Tsepinite-K Classification

Dana Class:

60.01.03b.03 (60)Cyclosilicate Four-Membered Rings

(60.01)as Titanosilicates

(60.01.03b)Labuntsovite Group (Vuoriyarvite subgroup Monoclinic [Cm])

60.01.03b.01 Vuoriyarvite-K! (K,Na)2(Nb,Ti)2Si4O12(O,OH)2•4(H2O) Cm m

60.01.03b.02 Tsepinite-Na! (Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2•3(H2O) Cm m

60.01.03b.03 Tsepinite-K! (K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2•3(H2O) Cm m

60.01.03b.04 Tsepinite-Ca! (Ca,K,Na,[])2(Ti,Nb)2(Si4O12)(OH,O)2•4(H2O) C 2/m 2/m

60.01.03b.05 Paratsepinite-Ba! (Ba,Na,K)2-x(Ti,Nb)2(Si4O12)(OH,O)2•4(H2O) C 2/m 2/m

60.01.03b.06 Tsepinite-Sr! (Sr,Ba,K)(Ti,Nb)2(Si4O12)(OH,O)2•3(H2O) Cm m

Strunz Class:

09.CE.30b 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CE -[Si4O12]8- 4-membered single rings (vierer-Einfachringe),

09.CE.30b Vuoriyarvite-K! (K,Na)2(Nb,Ti)2Si4O12(O,OH)2•4(H2O) Cm m

09.CE.30b Tsepinite-Sr! (Sr,Ba,K)(Ti,Nb)2(Si4O12)(OH,O)2•3(H2O) Cm m

09.CE.30b Tsepinite-Ca! (Ca,K,Na,[])2(Ti,Nb)2(Si4O12)(OH,O)2•4(H2O) C 2/m 2/m

09.CE.30b Tsepinite-K! (K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2•3(H2O) Cm m

09.CE.30b Tsepinite-Na! (Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2•3(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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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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: 60.01.03b.03 Strunz No: 09.CE.30b
Locality:

Notes: