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Tsepinite-Na Mineral Data

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General Tsepinite-Na Information

Help on Chemical  Formula: Chemical Formula: (Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2•3(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: H34.4Na4.2K0.8Sr0.5Ba0.4Ca0.1Ti4.2Nb3.7Fe3+0.1Si16O70.8
Help on Environment: Environment: Alkaline rocks. Labuntsovite group; structure
Help on IMA Status: IMA Status: Approved IMA 2000 (Dana # Added)
Help on Locality: Locality: Khibinpaschchorr, Khibiny alkaline complex, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Anatoliy I. Tsepin (1946-), Russian microprobe analyst.
Help on Synonym: Synonym: IMA2000-046

Tsepinite-Na Image

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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

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Comments: Subparallel pale tan prismatic tsepinite-Na crystals with vitreous luster.
Location: Lepkhe-Nel'm Mt. (Lepkhe-Nelm Mt.), Seidozero Lake, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: See Image.
© Rruff Database

Tsepinite-Na Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0231:1:0.5557
Help on Cell Dimensions: Cell Dimensions: a = 14.604, b = 14.274, c = 7.933, Z = 1; beta = 117.4° V = 1,468.17 Den(Calc)= 2.71
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): 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

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, White, Light brown.
Help on Density: Density: 2.74
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Tsepinite-Na

Help on Gladstone-Dale: 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
Ncalc = 1.7 - 1.71
Help on Optical Data: Optical Data: Biaxial (+), a=1.658-1.661, b=1.668, g=1.77, bire=0.1090-0.1120

Calculated Properties of Tsepinite-Na

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.66 gm/cc
note: Specific Gravity of Tsepinite-Na =2.71 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PETsepinite-Na = 34.41 barns/electron
U=PETsepinite-Na x relectron= 91.49 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 18.45 (Gamma Ray American Petroleum Institute Units)
Concentration of Tsepinite-Na per GRapi unit = 5.42 (%)

Estimated Radioactivity from Tsepinite-Na - barely detectable


Tsepinite-Na Classification

Help on  Dana Class: Dana Class: 60.01.03b.02 (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-Na Information

Help on References: References: NAME( AmMin, v 87, p 1734) PHYS. PROP.(AmMin, v 87, p 1734) OPTIC PROP.(AmMin, v 87, p 1734)
Help on See Also: 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 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: 60.01.03b.02 Strunz No: 09.CE.30b





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