Labuntsovite-Mn Mineral Data

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General Labuntsovite-Mn Information

Chemical Formula:

Na4K4(Ba,K)(Mn,Fe)1+x(Ti,Nb)8[Si4O12]4(O,OH)8•n(H2O), n=10-12

Composition:

Molecular Weight = 2,232.12 gm

Potassium 5.96 % K 7.17 % K₂O

Barium 8.00 % Ba 8.93 % BaO

Sodium 2.37 % Na 3.19 % Na₂O

Calcium 0.90 % Ca 1.26 % CaO

Magnesium 0.22 % Mg 0.36 % MgO

Titanium 15.44 % Ti 25.77 % TiO₂

Manganese 1.72 % Mn 2.22 % MnO

Niobium 0.83 % Nb 1.19 % Nb₂O₅

Aluminum 0.73 % Al 1.37 % Al₂O₃

Iron 1.00 % Fe 1.43 % Fe₂O₃

Silicon 18.37 % Si 39.30 % SiO₂

Hydrogen 0.87 % H 7.79 % H₂O

Oxygen 43.59 % O

______ ______

100.00 % 99.99 % = TOTAL OXIDE

Empirical Formula:

K_3.4Na_2.3Ba_1.3Mn²⁺_0.7Ca_0.5Ti_7.2Fe³⁺_0.4Nb_0.2Mg_0.2Si_14.6Al_0.6O_46.32(OH)_9.7·4.8(H₂O)

Environment:

A hydrothermal alteration product of murmanite in alkalic pegmatites in a differentiated alkalic massif and in carbonatite. Renamed labunsovite in 1955 from titanoelpidite.

IMA Status:

Valid Species (Pre-IMA) 1926 (Dana # Changed from 60.1.3.2)

Locality:

In the Lovozero, Khibiny, and Kovdor massifs and the Vuoriyarvi carbonatite complex, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Aleksander Nikolaevich Labuntsov and Ekaterina Eutikhieva Labuntsov-Kostyleva, Russian mineralogists.

Name Pronunciation:

Labuntsovite-Mn + Pronunciation

Synonym:

IMA2000-A

Labuntsovite - (60.1.3.2)

Titanoelpidite

Labuntsovite-Mn Image

Images:

Labuntsovite-Mn

Comments: Cinnamon colored crystals of labuntsovite-Mn to 3 mm on dolomite matrix.
Location: Kovdor Mine, Kola Peninsula, Russia. Scale: Picture size 1.5x2 cm.
© John Veevaert

Labuntsovite-Mn Crystallography

Axial Ratios:

a:b:c =0.956:1:0.885

Cell Dimensions:

a = 14.8, b = 15.48, c = 13.7, Z = 2; beta = 117° V = 2,796.62 Den(Calc)= 2.65

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/m

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

By Intensity(I/I_o): 3.15(1), 1.543(0.9), 2.56(0.9),

Forms:

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Crystal Structure:

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Rastsvetaeva R K , Chukanov N V , Pekov I V , Shlyukova Z V , Khomyakov A P , Crystallography Reports , 43 (1998) p.820-827, Structures of two potassium-rich labuntsovites in relation to the crystal chemistry, of minerals of the labuntsovite-nenadkevichite family, Sample: I

Physical Properties of Labuntsovite-Mn

Cleavage:

{100} Perfect

Color:

Brownish yellow, Pink, Reddish brown.

Density:

2.89 - 3.02, Average = 2.95

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Subconchoidal - Brittle frature with subconchoidal fragments

Habit:

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

Hardness:

6 - Orthoclase

Luster:

Greasy (Oily)

Streak:

white

Optical Properties of Labuntsovite-Mn

Gladstone-Dale:

CI meas= 0.047 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2755,KPDmeas= 0.247,KC= 0.2593
Ncalc = 1.69 - 1.78

Optical Data:

Biaxial (+), a=1.684-1.695, b=1.693-1.702, g=1.792-1.814, bire=0.1080-0.1190, 2V(Calc)=30-36, 2V(Meas)=20-44.

Pleochroism (x):

yellowish.

Pleochroism (z):

yellowish brown.

Calculated Properties of Labuntsovite-Mn

Electron Density:

Bulk Density (Electron Density)=2.88 gm/cc
note: Specific Gravity of Labuntsovite-Mn =2.96 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_{Labuntsovite-Mn}= 38.89 barns/electron
U=PE_{Labuntsovite-Mn} x r_electron= 112.00 barns/cc.

Radioactivity:

GRapi = 83.77 (Gamma Ray American Petroleum Institute Units)
Concentration of Labuntsovite-Mn per GRapi unit = 1.19 (%)

Estimated Radioactivity from Labuntsovite-Mn - barely detectable

Labuntsovite-Mn Classification

Dana Class:

60.01.03e.01 (60)Cyclosilicate Four-Membered Rings

(60.01)as Titanosilicates

(60.01.03e)Labuntsovite Group (Labuntsovite subgroup Monoclinic [C2/m])

60.01.03e.01 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

60.01.03e.02 Labuntsovite-Mg! Na4K4(Ba,K)(Mg,Fe)1xTi8(Si4O12)4(O,OH)8•10(H2O) C 2/m 2/m

60.01.03e.03 Labuntsovite-Fe! Na4K4(Ba,K)2(Fe,Mg,Mn)1xTi8(Si4O12)4(O,OH)8•10(H2O) C 2/m 2/m

60.01.03e.04 Paratsepinite-Na! (Na,Sr,K,Ca)7(Ti,Nb)8[Si4O12]4(O,OH)8•n(H2O)n~8 C 2/m 2/m

60.01.03e.05 Gjerdingenite-Mn! (K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4•6(H2O) C 2/m 2/m

60.01.03e.06 Gjerdingenite-Fe! K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]•4(H2O) C 2/m 2/m

60.01.03e.07 Gjerdingenite-Ca! K2Ca(Nb,Ti)4(Si4O12)2(O,OH)4•6H2O C 2/m 2/m

60.01.03e.08 Gjerdingenite-Na! (K,Na)2Na(Nb,Ti)4(Si4O12)2(OH,O)4•5H2O C 2/m 2/m

Strunz Class:

09.CE.30e 09 - SILICATES (Germanates)

09.C - Cyclosilicates

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

09.CE.30e 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

09.CE.30e Labuntsovite-Mg! Na4K4(Ba,K)(Mg,Fe)1xTi8(Si4O12)4(O,OH)8•10(H2O) C 2/m 2/m

09.CE.30e Labuntsovite-Fe! Na4K4(Ba,K)2(Fe,Mg,Mn)1xTi8(Si4O12)4(O,OH)8•10(H2O) C 2/m 2/m

Other Labuntsovite-Mn Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Labuntsovite-Mn :
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 Labuntsovite-Mn Specimen Label here :

Labuntsovite-Mn

Na4K4(Ba,K)(Mn,Fe)1+x(Ti,Nb)8[Si4O12]4(O,OH)8•n(H2O), n=10-12
Dana No: 60.01.03e.01 Strunz No: 09.CE.30e
Locality:

Notes: