Labuntsovite-Mg Mineral Data

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General Labuntsovite-Mg Information

Chemical Formula:

Na4K4(Ba,K)(Mg,Fe)1+xTi8(Si4O12)4(O,OH)8•10(H2O)

Composition:

Molecular Weight = 2,384.94 gm

Potassium 7.21 % K 8.69 % K₂O

Barium 5.76 % Ba 6.43 % BaO

Sodium 3.47 % Na 4.68 % Na₂O

Magnesium 0.71 % Mg 1.18 % MgO

Titanium 14.45 % Ti 24.11 % TiO₂

Niobium 2.73 % Nb 3.90 % Nb₂O₅

Aluminum 0.11 % Al 0.21 % Al₂O₃

Iron 1.17 % Fe 1.20 % FeO / 0.33 % Fe₂O₃

Silicon 18.72 % Si 40.06 % SiO₂

Hydrogen 1.04 % H 9.33 % H₂O

Oxygen 44.61 % O

______ ______

100.00 % 100.13 % = TOTAL OXIDE

Empirical Formula:

Na_3.6K_4.4(H₂O)_2.2BaMg_0.7Fe²⁺_0.4Ti_7.2Nb_0.7Fe³⁺_0.1Si_15.9Al_0.1O_52.4(OH)_3.5·8.4(H₂O)

Environment:

Occurs with catapleiite and anatase in cavities within dolomitic carbonatite. Labuntsovite group, structure.

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Kovdor massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named as the Mg dominant member of the labuntsovite subgroup.

Name Pronunciation:

Labuntsovite-Mg + Pronunciation

Synonym:

IMA1998-050

IMA2000-A

Labuntsovite

Labuntsovite-Mg Image

Images:

Labuntsovite-Mg

Comments: Orange-brown crystal of labuntsovite-Mg, sitting on a bed of platy catapleiite crystals, with dolomite.
Location: Zheleznyi Mine (Iron Mine), Kovdor Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Crystal Size 0.15 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Labuntsovite-Mg Crystallography

Axial Ratios:

a:b:c =1.0394:1:0.5666

Cell Dimensions:

a = 14.292, b = 13.75, c = 7.792, Z = 1; beta = 117.03° V = 1,363.99 Den(Calc)= 2.90

Crystal System:

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

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

By Intensity(I/I_o): 3.175(1)(400,402,421), 3.093(0.57)(022), 3.083(0.55)(041),3.024(0.51)(240,241), 2.576(0.48)(241,242), 6.94(0.3)(001),

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Physical Properties of Labuntsovite-Mg

Cleavage:

{001} Imperfect, {???} Imperfect

Color:

Colorless, Yellowish white, Pink, Light orange.

Density:

2.88

Diaphaneity:

Translucent to transparent

Fracture:

Stepped - Fracture surfaces resemble stair case steps

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 Labuntsovite-Mg

Gladstone-Dale:

CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.037 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2508,KPDmeas= 0.2525,KC= 0.2605
Ncalc = 1.75 - 1.76

Optical Data:

Biaxial (+), a=1.688, b=1.692, g=1.802, bire=0.1140

Calculated Properties of Labuntsovite-Mg

Electron Density:

Bulk Density (Electron Density)=2.82 gm/cc
note: Specific Gravity of Labuntsovite-Mg =2.88 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Labuntsovite-Mg}= 31.76 barns/electron
U=PE_{Labuntsovite-Mg} x r_electron= 89.60 barns/cc.

Radioactivity:

GRapi = 101.99 (Gamma Ray American Petroleum Institute Units)
Concentration of Labuntsovite-Mg per GRapi unit = 0.98 (%)

Estimated Radioactivity from Labuntsovite-Mg - barely detectable

Labuntsovite-Mg Classification

Dana Class:

60.01.03e.02 (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-Mg Information

References:

NAME( AmMin, v 87, p 1733) PHYS. PROP.(AmMin, v 87, p 1733) OPTIC PROP.(AmMin, v 87, p 1733)

See Also:

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

Labuntsovite-Mg

Na4K4(Ba,K)(Mg,Fe)1+xTi8(Si4O12)4(O,OH)8•10(H2O)
Dana No: 60.01.03e.02 Strunz No: 09.CE.30e
Locality:

Notes: