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Tsepinite-Ca Mineral Data

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General Tsepinite-Ca Information

Help on Chemical  Formula: Chemical Formula: (Ca,K,Na,[ ])2(Ti,Nb)2(Si4O12)(OH,O)2•4(H2O)
Help on Composition: Composition: Molecular Weight = 1,200.24 gm
   Potassium   1.82 %  K     2.20 % K2O
   Barium      3.09 %  Ba    3.45 % BaO
   Sodium      0.98 %  Na    1.32 % Na2O
   Strontium   2.56 %  Sr    3.02 % SrO
   Calcium     3.74 %  Ca    5.23 % CaO
   Titanium   13.04 %  Ti   21.76 % TiO2
   Niobium     6.27 %  Nb    8.97 % Nb2O5
   Silicon    19.05 %  Si   40.75 % SiO2
   Hydrogen    1.48 %  H    13.20 % H2O
   Oxygen     47.98 %  O
             ______        ______ 
             100.00 %       99.90 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca1.12K0.56Na0.51Sr0.35Ba0.27Ti3.27Nb0.81Si8.14O24.42(OH)2.45O1.55�7.57(H2O)
Help on Environment: Environment: In the hydrothermally altered zone of a large aegirine-nepheline-K-spar pegmatite. Labuntsovite group; structure determined.
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: Lovchorrite mine, Hackman Valley, Yukspor Mountian, Khibina massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the Ca-dominant analogue of tsepinite-Na.
Help on Synonym: Synonym: IMA2002-020

Tsepinite-Ca Image

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Comments: Groups of tan colored parallel prismatic tsepinitie-Ca crystals associated with eudialyte and arfvedsonite.
Location: Hackmann Valley, Yukspor Mountain, Khibiny, Kola, Russia. Scale: See Image.
© Rruff Database

Tsepinite-Ca Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0206:1:0.5571
Help on Cell Dimensions: Cell Dimensions: a = 14.484, b = 14.191, c = 7.907, Z = 2; beta = 117.26° V = 1,444.72 Den(Calc)= 2.76
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.16(1)(041,022), 2.51(0.85)(441,403,042)7.02(0.6)(020,001), 1.718(0.5)(463,461,442,02.62(0.45)(203,202), 3.53(0.45)(131), 6.38(0.4)(201),

Physical Properties of Tsepinite-Ca

Help on Cleavage: Cleavage: None
Help on Color: Color: White, Pale brownish white.
Help on Density: Density: 2.73
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Tsepinite-Ca

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.025 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.036 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2563,KPDmeas= 0.2591,KC= 0.2658
Ncalc = 1.73
Help on Optical Data: Optical Data: Biaxial (+), a=1.666, b=1.676, g=1.78, bire=0.1140, 2V(Calc)=38, 2V(Meas)=30. Dispersion r < v very weak.

Calculated Properties of Tsepinite-Ca

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.69 gm/cc
note: Specific Gravity of Tsepinite-Ca =2.73 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PETsepinite-Ca = 27.85 barns/electron
U=PETsepinite-Ca x relectron= 74.96 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 25.96 (Gamma Ray American Petroleum Institute Units)
Concentration of Tsepinite-Ca per GRapi unit = 3.85 (%)

Estimated Radioactivity from Tsepinite-Ca - barely detectable


Tsepinite-Ca Classification

Help on  Dana Class: Dana Class: 60.01.03b.04 (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-Ca Information

Help on References: References: NAME( CanMin, v 42 ,p 940) PHYS. PROP.(CanMin, v 42 ,p 940) OPTIC PROP.(CanMin, v 42 ,p 940)
Help on See Also: See Also: Links to other databases for Tsepinite-Ca :
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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(Ca,K,Na,[ ])2(Ti,Nb)2(Si4O12)(OH,O)2•4(H2O)
Dana No: 60.01.03b.04 Strunz No: 09.CE.30b





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