Paratsepinite-Ba Mineral Data

Paratsepinite-Ba Mineral Data

General Paratsepinite-Ba Information

Chemical Formula:

(Ba,Na,K)2-x(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O)

Composition:

Molecular Weight = 628.25 gm

Potassium 1.43 % K 1.72 % K₂O

Barium 10.06 % Ba 11.23 % BaO

Sodium 1.35 % Na 1.83 % Na₂O

Strontium 1.67 % Sr 1.98 % SrO

Titanium 10.75 % Ti 17.93 % TiO₂

Manganese 0.96 % Mn 1.24 % MnO

Niobium 8.13 % Nb 11.64 % Nb₂O₅

Silicon 18.33 % Si 39.21 % SiO₂

Hydrogen 1.45 % H 12.96 % H₂O

Oxygen 45.87 % O

______ ______

100.00 % 99.73 % = TOTAL OXIDE

Empirical Formula:

Ba_0.46Na_0.37K_0.23Sr_0.12Mn²⁺_0.11Ti_1.41Nb_0.55Si_4.1O_12.39(OH)_1.8O_0.2·3.62(H₂O)

Environment:

Hydrothermal mineral in an alkaline pegmatite. Labuntsovite group; structure determined.

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Lepkhe-Nelm Mountain, Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the relationship to tsepinite-Na.

Synonym:

IMA2002-006

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Paratsepinite-Ba Crystallography

Axial Ratios:

a:b:c =1.0392:1:1.1214

Cell Dimensions:

a = 14.551, b = 14.001, c = 15.702, Z = 8; beta = 117.58° V = 2,835.43 Den(Calc)= 2.94

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): 3.95(1)(202,204), 7.11(1)(020), 1.914(0.9)(208),3.24(0.9)(400,404), 2.403(0.8)(602), 3.11(0.8)(042,024), 4.08(0.8)(310),

Physical Properties of Paratsepinite-Ba

Cleavage:

None

Color:

Brown.

Density:

2.88

Diaphaniety:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

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

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Paratsepinite-Ba

Gladstone-Dale:

CI meas= 0.037 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.057 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2393,KPDmeas= 0.2443,KC= 0.2538

Optical Data:

Biaxial (+), a=1.667, b=1.674, g=1.77, bire=0.1030, 2V(Calc)=32, 2V(Meas)=30. Dispersion dispersion not observed.

Calculated Properties of Paratsepinite-Ba

Electron Density:

r_electron=2.80 gm/cc
note: r_{Paratsepinite-Ba}=2.88 gm/cc.

Fermion Index

Fermion Index = 0.04176
Boson Index = 0.95824

Photoelectric:

PE_{Paratsepinite-Ba}= 58.01 barns/electron
U=PE_{Paratsepinite-Ba} x r_electron= 162.52 barns/cc.

Radioactivity:

GRapi = 20.11 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Paratsepinite-Ba - barely detectable

Paratsepinite-Ba Classification

Dana Class:

60.1.3b.5 (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.07-34 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 Paratsepinite-Ba Information

References:

NAME( CanMin, v 42, p 234) PHYS. PROP.(CanMin, v 42, p 234) OPTIC PROP.(CanMin, v 42, p 234)

See Also:

Links to other databases for Paratsepinite-Ba :
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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Paratsepinite-Ba

(Ba,Na,K)2-x(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O)
Dana No: 60.1.3b.5 Strunz No: VIII/E.07-34
Locality:

Notes: