Tsepinite-K Mineral Data (original) (raw)
General Tsepinite-K Information
Chemical Formula:
(K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2•3(H2O)
Composition:
Molecular Weight = 614.51 gm
Potassium 5.47 % K 6.59 % K2O
Barium 10.28 % Ba 11.48 % BaO
Sodium 1.61 % Na 2.17 % Na2O
Titanium 12.93 % Ti 21.58 % TiO2
Manganese 0.89 % Mn 1.15 % MnO
Niobium 4.99 % Nb 7.14 % Nb2O5
Iron 0.27 % Fe 0.39 % Fe2O3
Silicon 18.28 % Si 39.11 % SiO2
Hydrogen 1.16 % H 10.39 % H2O
Oxygen 44.11 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
K0.86Ba0.46Na0.43Mn2+0.1Ti1.66Nb0.33Fe3+0.03Si4O12(OH)1.21O0.79�2.94(H2O)
Environment:
Alkaline pegmatites as pseudomorphs after murmanite. Labuntsovite group; structure determined.
IMA Status:
Approved IMA 2003 (Dana # Added)
Locality:
Mt. Karnasurt, Lovozero alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Name Origin:
Named as the K-dominant analog of tsepinite-Na.
Synonym:
IMA2002-005
Tsepinite-K Image
Images:
 |
Tsepinite-K Comments: Light orange acicular crystals of tsepinite_K. Location: Karnasurt Mt, Lovozero Massif, Kola Peninsula, Murmanskaya Oblast'; Northern Region,.Scale: See Image. © Rruff Database |
|---|
Tsepinite-K Crystallography
Axial Ratios:
a:b:c =1.038:1:0.5639
Cell Dimensions:
a = 14.327, b = 13.802, c = 7.783, Z = 4; beta = 116.95° V = 1,371.89 Den(Calc)= 2.98
Crystal System:
Monoclinic - DomaticH-M Symbol (m) Space Group: Cm
X Ray Diffraction:
By Intensity(I/Io): 6.87(1)(001,020), 2.56(0.9)(203,331), 3.05(0.8)(022,041),3(0.6)(240,241), 3.2(0.6)(400), 3.95(0.5), 4.85(0.5),
Crystal Structure:
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| | Rosenberg K A , Rastsvetaeva R K , Pekov I V , Chukanov N V , Verin I A , Doklady Akademii Nauk SSSR , 393 (2003) p.784-787, Crystal structure of Sr-rich tsepinite | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
Physical Properties of Tsepinite-K
Cleavage:
{???} Imperfect
Color:
Light brown, White, Colorless.
Density:
2.88
Diaphaneity:
Transparent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
Optical Properties of Tsepinite-K
Gladstone-Dale:
CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2451,KPDmeas= 0.2536,KC= 0.2558
Ncalc = 1.74 - 1.76
Optical Data:
Biaxial (+), a=1.69, b=1.701, g=1.8, bire=0.1100
Calculated Properties of Tsepinite-K
Electron Density:
Bulk Density (Electron Density)=2.80 gm/cc
note: Specific Gravity of Tsepinite-K =2.88 gm/cc.
Fermion Index:
Fermion Index = 0.04
Boson Index = 0.96
Photoelectric:
PETsepinite-K = 53.39 barns/electron
U=PETsepinite-K x relectron= 149.53 barns/cc.
Radioactivity:
GRapi = 76.77 (Gamma Ray American Petroleum Institute Units)
Concentration of Tsepinite-K per GRapi unit = 1.30 (%)
Estimated Radioactivity from Tsepinite-K 
- barely detectable
Tsepinite-K Classification
Dana Class:
60.01.03b.03 (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-K Information
References:
NAME( AmMin, v 89, p 895) PHYS. PROP.(AmMin, v 89, p 895) OPTIC PROP.(AmMin, v 89, p 895)
See Also:
Links to other databases for Tsepinite-K :
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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Tsepinite-K
(K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2•3(H2O)
Dana No: 60.01.03b.03 Strunz No: 09.CE.30b
Locality:
Notes: