Neskevaaraite-Fe Mineral Data

Neskevaaraite-Fe Mineral Data

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General Neskevaaraite-Fe Information

Chemical Formula:

NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4·6(H2O)

Composition:

Molecular Weight = 1,235.20 gm

Potassium 7.31 % K 8.81 % K₂O

Barium 3.00 % Ba 3.35 % BaO

Sodium 2.31 % Na 3.11 % Na₂O

Magnesium 0.45 % Mg 0.75 % MgO

Titanium 9.03 % Ti 15.07 % TiO₂

Manganese 0.40 % Mn 0.52 % MnO

Niobium 12.56 % Nb 17.97 % Nb₂O₅

Iron 1.40 % Fe 1.80 % FeO

Silicon 18.35 % Si 39.26 % SiO₂

Hydrogen 1.05 % H 9.39 % H₂O

Oxygen 44.13 % O

______ ______

100.00 % 100.03 % = TOTAL OXIDE

Empirical Formula:

Na_1.24K_2.31Ba_0.27Fe²⁺_0.31Mg_0.23Mn²⁺_0.09Ti_2.33Nb_1.67Si_8.07O_24.21O_2.86(OH)_1.12·5.88(H₂O)

Environment:

In a hydrothermally altered carbonatite body. Labuntsovite group; structure determined.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Drillcore from the Neskevaara Hill, central part of the Vuoriyarvi alkaline-ultrabasic massif, northern Karelia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality and composition.

Synonym:

IMA2002-007

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Neskevaaraite-Fe Crystallography

Axial Ratios:

a:b:c =1.0388:1:0.5633

Cell Dimensions:

a = 14.45, b = 13.91, c = 7.836, Z = 2; beta = 117.42° V = 1,398.08 Den(Calc)= 2.93

Crystal System:

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

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

By Intensity(I/I_o): 3.21(1)(421,402), 6.93(1)(001,020), 3.11(0.9)(041,022), 4.93(0.8)(021), 2.62(0.6)(241,242,202), 2.49(0.5)(401,403), 1.687(0.4)(821,82

Physical Properties of Neskevaaraite-Fe

Cleavage:

None

Color:

Pale brown.

Density:

2.88

Diaphaniety:

Translucent to transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

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

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Neskevaaraite-Fe

Gladstone-Dale:

CI meas= 0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2447,KPDmeas= 0.249,KC= 0.2543

Optical Data:

Biaxial (+), a=1.677, b=1.684, g=1.79, bire=0.1130, 2V(Calc)=32, 2V(Meas)=25. Dispersion dispersion not observed.

Calculated Properties of Neskevaaraite-Fe

Electron Density:

r_electron=2.82 gm/cc
note: r_{Neskevaaraite-Fe}=2.88 gm/cc.

Fermion Index

Fermion Index = 0.02656
Boson Index = 0.97344

Photoelectric:

PE_{Neskevaaraite-Fe}= 33.99 barns/electron
U=PE_{Neskevaaraite-Fe} x r_electron= 95.72 barns/cc.

Radioactivity:

GRapi = 103.18 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Neskevaaraite-Fe - barely detectable

Neskevaaraite-Fe Classification

Dana Class:

60.1.3f.3 (60)Cyclosilicate Four-Membered Rings

(60.1)as Titanosilicates

(60.1.3f)Labuntsovite Group (Gutkovaite subgroup Monoclinic [Cm])

60.1.3f.1 Gutkovaite-Mn! CaK2Mn(Ti,Nb)4(Si4O12)2(O,OH)4·5(H2O) Cm m

60.1.3f.2 Alsakharovite-Zn! NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) Cm m

60.1.3f.3 Neskevaaraite-Fe ! NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4·6(H2O) Cm m

Strunz Class:

VIII/E.07-205 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 Neskevaaraite-Fe Information

References:

NAME( CanMin, 24:1249) PHYS. PROP.(CanMin, 24:1249) OPTIC PROP.(CanMin, 24:1249)

See Also:

Links to other databases for Neskevaaraite-Fe :
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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Print or Cut-and-Paste your Neskevaaraite-Fe Specimen Label here :

Neskevaaraite-Fe

NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4·6(H2O)
Dana No: 60.1.3f.3 Strunz No: VIII/E.07-205
Locality:

Notes: