Labuntsovite-Mg Mineral Data

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.

Synonym:

IMA1998-050

IMA2000-A

Labuntsovite

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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

Diaphaniety:

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= 0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2508,KPDmeas= 0.2525,KC= 0.2583

Optical Data:

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

Calculated Properties of Labuntsovite-Mg

Electron Density:

r_electron=2.82 gm/cc
note: r_{Labuntsovite-Mg}=2.88 gm/cc.

Fermion Index

Fermion Index = 0.03888
Boson Index = 0.96112

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)

Estimated Radioactivity from Labuntsovite-Mg - barely detectable

Labuntsovite-Mg Classification

Dana Class:

60.1.3e.2 (60)Cyclosilicate Four-Membered Rings

(60.1)as Titanosilicates

(60.1.3e)Labuntsovite Group (Labuntsovite subgroup Monoclinic [C2/m])

60.1.3e.1 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

60.1.3e.2 Labuntsovite-Mg ! Na4K4(Ba,K)(Mg,Fe)1xTi8(Si4O12)4(O,OH)8·10(H2O) C 2/m 2/m

60.1.3e.3 Labuntsovite-Fe! Na4K4(Ba,K)2(Fe,Mg,Mn)1xTi8(Si4O12)4(O,OH)8·10(H2O) C 2/m 2/m

60.1.3e.4 Paratsepinite-Na! (Na,Sr,K,Ca)7(Ti,Nb)8[Si4O12]4(O,OH)8·n(H2O)n~8 C 2/m 2/m

60.1.3e.5 Gjerdingenite-Mn! (K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) C 2/m 2/m

Strunz Class:

VIII/E.07-140 VIII - Silicates

VIII/E - Cyklosilicates, quadruplet rings [Si4O11]8-

VIII/E.07 - Labuntsovite Group

VIII/E.07-10 Korobitsynite! Na3(Ti,Nb)2[Si4O12](OH,O)2·3-4(H2O) Pbam 2/m 2/m 2/m

VIII/E.07-20 Nenadkevichite (Na,Ca,K)(Nb,Ti)Si2O6(O,OH)·2(H2O) Pbam 2/m 2/m 2/m

VIII/E.07-30* Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m

VIII/E.07-30 Tsepinite-Na! (Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2·3(H2O) Cm m

VIII/E.07-32 Tsepinite-K! (K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2·3(H2O) Cm m

VIII/E.07-33 Tsepinite-Ca! (Ca,K,Na,[])2(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m

VIII/E.07-34 Paratsepinite-Ba! (Ba,Na,K)2-x(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m

VIII/E.07-40 Vuoriyarvite-K! (K,Na)2(Nb,Ti)2Si4O12(O,OH)2·4(H2O) Cm m

VIII/E.07-50 Clinophosinaite! Na3CaPSiO7 P 2/c 2/m

VIII/E.07-50* Kuzmenkoite-Zn! K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4·6-8(H2O) Cm m

VIII/E.07-60* Kuzmenkoite-Mn! (K,Na)2(Mn,Fe)(Ti,Nb)4[Si4O12]2(OH)4·5(H2O) C 2/m 2/m

VIII/E.07-60 Phosinaite-(Ce)! Na13Ca2Ce[Si4O12](PO4)4 P 22121 2 2 2

VIII/E.07-70 Gjerdingenite-Fe! K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]·4(H2O) C 2/m 2/m

VIII/E.07-80 Gjerdingenite-Mn! (K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) C 2/m 2/m

VIII/E.07-90 Karupmollerite-Ca! (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4·7(H2O) C 2/m 2/m

VIII/E.07-100 Lemmleinite-K! NaK2(Ti,Nb)2Si4O12(O,OH)2·2(H2O) C 2/m 2/m

VIII/E.07-110 Lemmleinite-Ba! Na2K2Ba1-xTi4(Si4O12)2(O,OH)4·5(H2O) C 2/m 2/m

VIII/E.07-130 Paralabuntsovite-Mg! Na8K8Mg8Ti16(Si4O12)8(O,OH)16·n(H2O) I2/m 2/m

VIII/E.07-140 Labuntsovite-Mg Na4K4(Ba,K)(Mg,Fe)1xTi8(Si4O12)4(O,OH)8·10(H2O) C 2/m 2/m

VIII/E.07-150 Labuntsovite-Fe! Na4K4(Ba,K)2(Fe,Mg,Mn)1xTi8(Si4O12)4(O,OH)8·10(H2O) C 2/m 2/m

VIII/E.07-155 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

VIII/E.07-170 Parakuzmenkoite-Fe! (K,Ba)2Fe(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) C 2/m 2/m

VIII/E.07-180 Organovaite-Zn! K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) C 2/m 2/m

VIII/E.07-190 Organovaite-Mn! K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) Cm m

VIII/E.07-200 Gutkovaite-Mn! CaK2Mn(Ti,Nb)4(Si4O12)2(O,OH)4·5(H2O) Cm m

VIII/E.07-205 Neskevaaraite-Fe! NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4·6(H2O) Cm m

VIII/E.07-210 Alsakharovite-Zn! NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) Cm m

VIII/E.07-220 Lepkhenelmite-Zn! Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) Cm 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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Labuntsovite-Mg

Na4K4(Ba,K)(Mg,Fe)1+xTi8(Si4O12)4(O,OH)8·10(H2O)
Dana No: 60.1.3e.2 Strunz No: VIII/E.07-140
Locality:

Notes: