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Tsepinite-K Mineral Data

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General Tsepinite-K Information

Help on Chemical  Formula: Chemical Formula: (K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2•3(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: K0.86Ba0.46Na0.43Mn2+0.1Ti1.66Nb0.33Fe3+0.03Si4O12(OH)1.21O0.79�2.94(H2O)
Help on Environment: Environment: Alkaline pegmatites as pseudomorphs after murmanite. Labuntsovite group; structure determined.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Mt. Karnasurt, Lovozero alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the K-dominant analog of tsepinite-Na.
Help on Synonym: Synonym: IMA2002-005

Tsepinite-K Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.038:1:0.5639
Help on Cell Dimensions: Cell Dimensions: a = 14.327, b = 13.802, c = 7.783, Z = 4; beta = 116.95° V = 1,371.89 Den(Calc)= 2.98
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Cm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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),

Physical Properties of Tsepinite-K

Help on Cleavage: Cleavage: {???} Imperfect
Help on Color: Color: Light brown, White, Colorless.
Help on Density: Density: 2.88
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Tsepinite-K

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (+), a=1.69, b=1.701, g=1.8, bire=0.1100

Calculated Properties of Tsepinite-K

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.80 gm/cc
note: Specific Gravity of Tsepinite-K =2.88 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PETsepinite-K = 53.39 barns/electron
U=PETsepinite-K x relectron= 149.53 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( AmMin, v 89, p 895) PHYS. PROP.(AmMin, v 89, p 895) OPTIC PROP.(AmMin, v 89, p 895)
Help on See Also: 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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Dana No: 60.01.03b.03 Strunz No: 09.CE.30b





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