Tsepinite-Sr Mineral Data

General Tsepinite-Sr Information

Chemical Formula:

(Sr,Ba,K)(Ti,Nb)2(Si4O12)(OH,O)2•3(H2O)

Composition:

Molecular Weight = 572.95 gm

Potassium 1.09 % K 1.32 % K₂O

Barium 3.83 % Ba 4.28 % BaO

Sodium 0.44 % Na 0.59 % Na₂O

Strontium 4.28 % Sr 5.06 % SrO

Calcium 0.63 % Ca 0.88 % CaO

Titanium 11.03 % Ti 18.40 % TiO₂

Niobium 11.19 % Nb 16.01 % Nb₂O₅

Aluminum 0.09 % Al 0.18 % Al₂O₃

Zinc 0.23 % Zn 0.28 % ZnO

Iron 0.10 % Fe 0.13 % FeO

Silicon 19.51 % Si 41.74 % SiO₂

Hydrogen 1.24 % H 11.12 % H₂O

Oxygen 46.33 % O

______ ______

100.00 % 99.99 % = TOTAL OXIDE

Empirical Formula:

Sr_0.28Ba_0.16K_0.16Na_0.11Ca_0.09Zn_0.02Ti_1.32Nb_0.69Fe²⁺_0.01Si_3.98Al_0.02O₁₂(OH)_1.89O_0.11·2.59(H₂O)

Environment:

Found in hydrothermal paragenesis in cavities of nepheline-syenite pegmatite. Labuntsovite group (the vuoriyarvite subgroup)

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Eveslogchorr Mountain, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named as the Sr analog of tsepinite--Na, -K, and -Ca.

Synonym:

IMA2004-008

Tsepinite-Sr Image

Images:

Tsepinite-Sr

Comments: BSE image of crystals of tsepinite-Sr with Ba-enriched (light parts) margin zones..
Location: Mt. Eveslogchorr, Khibiny. Russia.. Scale: See Image.
© New Data on Minerals. M., 2005. Vol. 40

Tsepinite-Sr Crystallography

Axial Ratios:

a:b:c =1.0192:1:0.5543

Cell Dimensions:

a = 14.49, b = 14.216, c = 7.88, Z = 4; beta = 117.1° V = 1,444.99 Den(Calc)= 2.63

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Cm

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

By Intensity(I/I_o): 3.23(1), 7.1(0.9), 2.51(0.8),3.135(0.8), 1.728(0.5), 6.45(0.5), 1.57(0.45), 5.01(0.4),

Physical Properties of Tsepinite-Sr

Cleavage:

None

Color:

Colorless, White.

Density:

2.67

Diaphaneity:

Translucent to transparent

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Tsepinite-Sr

Gladstone-Dale:

CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2631,KPDmeas= 0.2592,KC= 0.2593
Ncalc = 1.68 - 1.69

Optical Data:

Biaxial (+), a=1.649, b=1.657, g=1.77, bire=0.1210, 2V(Calc)=32, 2V(Meas)=20. Dispersion very weak r,v.

Calculated Properties of Tsepinite-Sr

Electron Density:

Bulk Density (Electron Density)=2.61 gm/cc
note: Specific Gravity of Tsepinite-Sr =2.67 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Tsepinite-Sr= 39.54 barns/electron
U=PE_Tsepinite-Sr x r_electron= 103.04 barns/cc.

Radioactivity:

GRapi = 15.38 (Gamma Ray American Petroleum Institute Units)
Concentration of Tsepinite-Sr per GRapi unit = 6.50 (%)

Estimated Radioactivity from Tsepinite-Sr - barely detectable

Tsepinite-Sr Classification

Dana Class:

60.01.03b.06 (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-Sr Information

References:

NAME( New Data on Minerals, v40:11) PHYS. PROP.(New Data on Minerals, v40:11) OPTIC PROP.(New Data on Minerals, v40:11)

See Also:

Links to other databases for Tsepinite-Sr :
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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Print or Cut-and-Paste your Tsepinite-Sr Specimen Label here :

Tsepinite-Sr

(Sr,Ba,K)(Ti,Nb)2(Si4O12)(OH,O)2•3(H2O)
Dana No: 60.01.03b.06 Strunz No: 09.CE.30b
Locality:

Notes: