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_0.2ï¿½3.62(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

Paratsepinite-Ba Image

Images:

Paratsepinite-Ba

Comments: Prismatic crystal aggregate of paratsepinite-Ba in pink eudialyte and dark brown acicular astrophyllite.
Location: Lepkhe-Nel'm Mt., Seidozero Lake, Lovozero Massif, Kola Peninsula, Russia. Scale: Picture Size 6 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

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 - Prismatic H-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.95(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

Diaphaneity:

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
Ncalc = 1.73 - 1.75

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:

Bulk Density (Electron Density)=2.80 gm/cc
note: Specific Gravity of Paratsepinite-Ba =2.88 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

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)
Concentration of Paratsepinite-Ba per GRapi unit = 4.97 (%)

Estimated Radioactivity from Paratsepinite-Ba - barely detectable

Paratsepinite-Ba Classification

Dana Class:

60.01.03b.05 (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.30i 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CE -[Si4O12]8- 4-membered single rings (vierer-Einfachringe),

09.CE.30i Paratsepinite-Na! (Na,Sr,K,Ca)7(Ti,Nb)8[Si4O12]4(O,OH)8•n(H2O)n~8 C 2/m 2/m

09.CE.30i Paratsepinite-Ba! (Ba,Na,K)2-x(Ti,Nb)2(Si4O12)(OH,O)2•4(H2O) C 2/m 2/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 - 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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Paratsepinite-Ba

(Ba,Na,K)2-x(Ti,Nb)2(Si4O12)(OH,O)2•4(H2O)
Dana No: 60.01.03b.05 Strunz No: 09.CE.30i
Locality:

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