Tsepinite-Ca Mineral Data

Tsepinite-Ca Mineral Data

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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_1.55·7.57(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

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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 - PrismaticH-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

Diaphaniety:

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

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:

r_electron=2.69 gm/cc
note: r_Tsepinite-Ca=2.73 gm/cc.

Fermion Index

Fermion Index = 0.03334
Boson Index = 0.96666

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)

Estimated Radioactivity from Tsepinite-Ca - barely detectable

Tsepinite-Ca Classification

Dana Class:

60.1.3b.4 (60)Cyclosilicate Four-Membered Rings

(60.1)as Titanosilicates

(60.1.3b)Labuntsovite Group (Vuoriyarvite subgroup Monoclinic [Cm])

60.1.3b.1 Vuoriyarvite-K! (K,Na)2(Nb,Ti)2Si4O12(O,OH)2·4(H2O) Cm m

60.1.3b.2 Tsepinite-Na! (Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2·3(H2O) Cm m

60.1.3b.3 Tsepinite-K! (K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2·3(H2O) Cm m

60.1.3b.4 Tsepinite-Ca ! (Ca,K,Na,[])2(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m

60.1.3b.5 Paratsepinite-Ba! (Ba,Na,K)2-x(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m

Strunz Class:

VIII/E.07-33 VIII - Silicates

VIII/E - Cyklosilicates, quadruplet rings [Si4O11]8-

VIII/E.07 - Labuntsovite Group

VIII/E.07-10 Korobitsynite! Na3(Ti,Nb)2[Si4O12](OH,O)2·3-4(H2O) Pbam 2/m 2/m 2/m

VIII/E.07-20 Nenadkevichite (Na,Ca,K)(Nb,Ti)Si2O6(O,OH)·2(H2O) Pbam 2/m 2/m 2/m

VIII/E.07-30* Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m

VIII/E.07-30 Tsepinite-Na! (Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2·3(H2O) Cm m

VIII/E.07-32 Tsepinite-K! (K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2·3(H2O) Cm m

VIII/E.07-33 Tsepinite-Ca (Ca,K,Na,[])2(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m

VIII/E.07-34 Paratsepinite-Ba! (Ba,Na,K)2-x(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m

VIII/E.07-40 Vuoriyarvite-K! (K,Na)2(Nb,Ti)2Si4O12(O,OH)2·4(H2O) Cm m

VIII/E.07-50 Clinophosinaite! Na3CaPSiO7 P 2/c 2/m

VIII/E.07-50* Kuzmenkoite-Zn! K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4·6-8(H2O) Cm m

VIII/E.07-60* Kuzmenkoite-Mn! (K,Na)2(Mn,Fe)(Ti,Nb)4[Si4O12]2(OH)4·5(H2O) C 2/m 2/m

VIII/E.07-60 Phosinaite-(Ce)! Na13Ca2Ce[Si4O12](PO4)4 P 22121 2 2 2

VIII/E.07-70 Gjerdingenite-Fe! K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]·4(H2O) C 2/m 2/m

VIII/E.07-80 Gjerdingenite-Mn! (K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) C 2/m 2/m

VIII/E.07-90 Karupmollerite-Ca! (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4·7(H2O) C 2/m 2/m

VIII/E.07-100 Lemmleinite-K! NaK2(Ti,Nb)2Si4O12(O,OH)2·2(H2O) C 2/m 2/m

VIII/E.07-110 Lemmleinite-Ba! Na2K2Ba1-xTi4(Si4O12)2(O,OH)4·5(H2O) C 2/m 2/m

VIII/E.07-130 Paralabuntsovite-Mg! Na8K8Mg8Ti16(Si4O12)8(O,OH)16·n(H2O) I2/m 2/m

VIII/E.07-140 Labuntsovite-Mg! Na4K4(Ba,K)(Mg,Fe)1xTi8(Si4O12)4(O,OH)8·10(H2O) C 2/m 2/m

VIII/E.07-150 Labuntsovite-Fe! Na4K4(Ba,K)2(Fe,Mg,Mn)1xTi8(Si4O12)4(O,OH)8·10(H2O) C 2/m 2/m

VIII/E.07-155 Labuntsovite-Mn Na4K4(Ba,K)(Mn,Fe)1x(Ti,Nb)8[Si4O12]4(O,OH)8·n(H2O),n=10-12 I2/m 2/m

VIII/E.07-170 Parakuzmenkoite-Fe! (K,Ba)2Fe(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) C 2/m 2/m

VIII/E.07-180 Organovaite-Zn! K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) C 2/m 2/m

VIII/E.07-190 Organovaite-Mn! K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) Cm m

VIII/E.07-200 Gutkovaite-Mn! CaK2Mn(Ti,Nb)4(Si4O12)2(O,OH)4·5(H2O) Cm m

VIII/E.07-205 Neskevaaraite-Fe! NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4·6(H2O) Cm m

VIII/E.07-210 Alsakharovite-Zn! NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) Cm m

VIII/E.07-220 Lepkhenelmite-Zn! Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4·7(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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Tsepinite-Ca

(Ca,K,Na,[ ])2(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O)
Dana No: 60.1.3b.4 Strunz No: VIII/E.07-33
Locality:

Notes: