Tsepinite-Na Mineral Data

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General Tsepinite-Na Information

Chemical Formula:

(Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2•3(H2O)

Composition:

Molecular Weight = 2,397.82 gm

Potassium 1.30 % K 1.57 % K₂O

Barium 2.29 % Ba 2.56 % BaO

Sodium 4.03 % Na 5.43 % Na₂O

Strontium 1.83 % Sr 2.16 % SrO

Calcium 0.17 % Ca 0.23 % CaO

Titanium 8.39 % Ti 13.99 % TiO₂

Niobium 14.34 % Nb 20.51 % Nb₂O₅

Iron 0.23 % Fe 0.33 % Fe₂O₃

Silicon 18.74 % Si 40.09 % SiO₂

Hydrogen 1.45 % H 12.92 % H₂O

Oxygen 47.24 % O

______ ______

100.00 % 99.80 % = TOTAL OXIDE

Empirical Formula:

H_34.4Na_4.2K_0.8Sr_0.5Ba_0.4Ca_0.1Ti_4.2Nb_3.7Fe³⁺_0.1Si₁₆O_70.8

Environment:

Alkaline rocks. Labuntsovite group; structure

IMA Status:

Approved IMA 2000 (Dana # Added)

Locality:

Khibinpaschchorr, Khibiny alkaline complex, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Anatoliy I. Tsepin (1946-), Russian microprobe analyst.

Synonym:

IMA2000-046

Tsepinite-Na Image

Images:

Tsepinite-Na

Comments: Brown, needle-like crystals of tsepinite-Na in matrix.
Location: Lephke-Nelm, Lovozero, Kola, Russia. Scale: Crystal size 3 mm.
© Tom Loomis / Dakota Matrix

Images:

Tsepinite-Na

Comments: Subparallel pale tan prismatic tsepinite-Na crystals with vitreous luster.
Location: Lepkhe-Nel'm Mt. (Lepkhe-Nelm Mt.), Seidozero Lake, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: See Image.
© Rruff Database

Tsepinite-Na Crystallography

Axial Ratios:

a:b:c =1.0231:1:0.5557

Cell Dimensions:

a = 14.604, b = 14.274, c = 7.933, Z = 1; beta = 117.4° V = 1,468.17 Den(Calc)= 2.71

Crystal System:

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

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

By Intensity(I/I_o): 7.09(1)(020,001), 3.24(0.9)(421,400,402), 3.15(0.8)(041,022,241), 2.54(0.7)(441,401,403), 2.06(0.6)(441,443), 2.63(0.6)(242

Crystal Structure:

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Rastsvetaeva R K , Organova N I , Rozhdestvenskaya I V , Shlyukova Z V , Chukanov N V , Doklady Chemistry , 371 (2000) p.52-56, Crystal structure of oxonium mineral of the nenadkevichite-labuntsovite group, from Khibiny massif, Locality: Khibinpakhchorr mountain, Khibiny massif, Kola Peninsula, Russia

Physical Properties of Tsepinite-Na

Cleavage:

None

Color:

Colorless, White, Light brown.

Density:

2.74

Diaphaneity:

Transparent to Translucent

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).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Tsepinite-Na

Gladstone-Dale:

CI meas= 0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.258,KPDmeas= 0.2552,KC= 0.2586
Ncalc = 1.7 - 1.71

Optical Data:

Biaxial (+), a=1.658-1.661, b=1.668, g=1.77, bire=0.1090-0.1120

Calculated Properties of Tsepinite-Na

Electron Density:

Bulk Density (Electron Density)=2.66 gm/cc
note: Specific Gravity of Tsepinite-Na =2.71 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Tsepinite-Na= 34.41 barns/electron
U=PE_Tsepinite-Na x r_electron= 91.49 barns/cc.

Radioactivity:

GRapi = 18.45 (Gamma Ray American Petroleum Institute Units)
Concentration of Tsepinite-Na per GRapi unit = 5.42 (%)

Estimated Radioactivity from Tsepinite-Na - barely detectable

Tsepinite-Na Classification

Dana Class:

60.01.03b.02 (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-Na Information

References:

NAME( AmMin, v 87, p 1734) PHYS. PROP.(AmMin, v 87, p 1734) OPTIC PROP.(AmMin, v 87, p 1734)

See Also:

Links to other databases for Tsepinite-Na :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Print or Cut-and-Paste your Tsepinite-Na Specimen Label here :

Tsepinite-Na

(Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2•3(H2O)
Dana No: 60.01.03b.02 Strunz No: 09.CE.30b
Locality:

Notes: