Tsepinite-Ca Mineral Data

General Tsepinite-Ca Information

Chemical Formula:

(Ca,K,Na,[ ])2(Ti,Nb)2(Si4O12)(OH,O)2•4(H2O)

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

Empirical Formula:

Ca_1.12K_0.56Na_0.51Sr_0.35Ba_0.27Ti_3.27Nb_0.81Si_8.14O_24.42(OH)_2.45O_1.55ï¿½7.57(H₂O)

Environment:

In the hydrothermally altered zone of a large aegirine-nepheline-K-spar pegmatite. Labuntsovite group; structure determined.

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Lovchorrite mine, Hackman Valley, Yukspor Mountian, Khibina massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named as the Ca-dominant analogue of tsepinite-Na.

Synonym:

IMA2002-020

Tsepinite-Ca Image

Images:

Tsepinite-Ca

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

Axial Ratios:

a:b:c =1.0206:1:0.5571

Cell Dimensions:

a = 14.484, b = 14.191, c = 7.907, Z = 2; beta = 117.26° V = 1,444.72 Den(Calc)= 2.76

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/I_o): 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

Cleavage:

None

Color:

White, Pale brownish white.

Density:

2.73

Diaphaneity:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Tsepinite-Ca

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

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

Electron Density:

Bulk Density (Electron Density)=2.69 gm/cc
note: Specific Gravity of Tsepinite-Ca =2.73 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Tsepinite-Ca= 27.85 barns/electron
U=PE_Tsepinite-Ca x r_electron= 74.96 barns/cc.

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

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

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

References:

NAME( CanMin, v 42 ,p 940) PHYS. PROP.(CanMin, v 42 ,p 940) OPTIC PROP.(CanMin, v 42 ,p 940)

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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Tsepinite-Ca

(Ca,K,Na,[ ])2(Ti,Nb)2(Si4O12)(OH,O)2•4(H2O)
Dana No: 60.01.03b.04 Strunz No: 09.CE.30b
Locality:

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