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Tsepinite-Sr Mineral Data

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General Tsepinite-Sr Information

Help on Chemical  Formula: Chemical Formula: (Sr,Ba,K)(Ti,Nb)2(Si4O12)(OH,O)2•3(H2O)
Help on Composition: Composition: Molecular Weight = 572.95 gm
   Potassium   1.09 %  K     1.32 % K2O
   Barium      3.83 %  Ba    4.28 % BaO
   Sodium      0.44 %  Na    0.59 % Na2O
   Strontium   4.28 %  Sr    5.06 % SrO
   Calcium     0.63 %  Ca    0.88 % CaO
   Titanium   11.03 %  Ti   18.40 % TiO2
   Niobium    11.19 %  Nb   16.01 % Nb2O5
   Aluminum    0.09 %  Al    0.18 % Al2O3
   Zinc        0.23 %  Zn    0.28 % ZnO
   Iron        0.10 %  Fe    0.13 % FeO
   Silicon    19.51 %  Si   41.74 % SiO2
   Hydrogen    1.24 %  H    11.12 % H2O
   Oxygen     46.33 %  O
             ______        ______ 
             100.00 %       99.99 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Sr0.28Ba0.16K0.16Na0.11Ca0.09Zn0.02Ti1.32Nb0.69Fe2+0.01Si3.98Al0.02O12(OH)1.89O0.11�2.59(H2O)
Help on Environment: Environment: Found in hydrothermal paragenesis in cavities of nepheline-syenite pegmatite. Labuntsovite group (the vuoriyarvite subgroup)
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Eveslogchorr Mountain, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the Sr analog of tsepinite--Na, -K, and -Ca.
Help on Synonym: Synonym: IMA2004-008

Tsepinite-Sr Image

Click Here for Larger   Image in a New Browser Window Images:
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Comments: BSE image of crystals of tsepinite-Sr with Ba-enriched (light parts) margin zones. (New Data on Minerals. M., 2005. Vol. 40).
Location: Mt. Eveslogchorr, Khibiny. Russia.. Scale: See Image.
© New Data on Minerals

Tsepinite-Sr Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0192:1:0.5543
Help on Cell Dimensions: Cell Dimensions: a = 14.49, b = 14.216, c = 7.88, Z = 4; beta = 117.1° V = 1,444.99 Den(Calc)= 2.63
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): 3.23(1), 7.1(0.9), 2.51(0.8),3.135(0.8), 1.728(0.5), 6.45(0.5), 1.57(0.45), 5.01(0.4),

Physical Properties of Tsepinite-Sr

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.67
Help on Diaphaneity: Diaphaneity: Translucent to transparent
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Tsepinite-Sr

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2631,KPDmeas= 0.2592,KC= 0.2593
Ncalc = 1.68 - 1.69
Help on Optical Data: Optical Data: Biaxial (+), a=1.649, b=1.657, g=1.77, bire=0.1210, 2V(Calc)=32, 2V(Meas)=20. Dispersion very weak r,v.

Calculated Properties of Tsepinite-Sr

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.61 gm/cc
note: Specific Gravity of Tsepinite-Sr =2.67 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PETsepinite-Sr = 39.54 barns/electron
U=PETsepinite-Sr x relectron= 103.04 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 15.38 (Gamma Ray American Petroleum Institute Units)
Concentration of Tsepinite-Sr per GRapi unit = 6.50 (%)

Estimated Radioactivity from Tsepinite-Sr - barely detectable


Tsepinite-Sr Classification

Help on  Dana Class: Dana Class: 60.01.03b.06 (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-Sr Information

Help on References: References: NAME( New Data on Minerals, v40:11) PHYS. PROP.(New Data on Minerals, v40:11) OPTIC PROP.(New Data on Minerals, v40:11)
Help on See Also: See Also: Links to other databases for Tsepinite-Sr :
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.06 Strunz No: 09.CE.30b





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