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

Neskevaaraite-Fe Image

Images:

Neskevaaraite-Fe

Comments: Aggregate of brown neskevaaraite-Fe crystals.
Location: Neskevaara Hill, Vuoriyarvi Massif, N.Karelia, Russia. Scale: Specimen Length 5 mm.
© Sergey Vasiliev / Systematic Mineralogy

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

Diaphaneity:

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
Ncalc = 1.73 - 1.75

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:

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

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

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)
Concentration of Neskevaaraite-Fe per GRapi unit = 0.97 (%)

Estimated Radioactivity from Neskevaaraite-Fe - barely detectable

Neskevaaraite-Fe Classification

Dana Class:

60.01.03f.03 (60)Cyclosilicate Four-Membered Rings

(60.01)as Titanosilicates

(60.01.03f)Labuntsovite Group (Gutkovaite subgroup Monoclinic [Cm])

60.01.03f.01 Gutkovaite-Mn! CaK2Mn(Ti,Nb)4(Si4O12)2(O,OH)4•5(H2O) Cm m

60.01.03f.02 Alsakharovite-Zn! NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O) Cm m

60.01.03f.03 Neskevaaraite-Fe! NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4•6(H2O) Cm m

Strunz Class:

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

09.C - Cyclosilicates

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

09.CE.30h Gutkovaite-Mn! CaK2Mn(Ti,Nb)4(Si4O12)2(O,OH)4•5(H2O) Cm m

09.CE.30h Alsakharovite-Zn! NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O) Cm m

09.CE.30h Neskevaaraite-Fe! NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4•6(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 - 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 Neskevaaraite-Fe Specimen Label here :

Neskevaaraite-Fe

NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4•6(H2O)
Dana No: 60.01.03f.03 Strunz No: 09.CE.30h
Locality:

Notes: