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Neskevaaraite-Fe Mineral Data

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General Neskevaaraite-Fe Information

Help on Chemical  Formula: Chemical Formula: NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4•6(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na1.24K2.31Ba0.27Fe2+0.31Mg0.23Mn2+0.09Ti2.33Nb1.67Si8.07O24.21O2.86(OH)1.12�5.88(H2O)
Help on Environment: Environment: In a hydrothermally altered carbonatite body. Labuntsovite group; structure determined.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Drillcore from the Neskevaara Hill, central part of the Vuoriyarvi alkaline-ultrabasic massif, northern Karelia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality and composition.
Help on Synonym: Synonym: IMA2002-007

Neskevaaraite-Fe Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.0388:1:0.5633
Help on Cell Dimensions: Cell Dimensions: a = 14.45, b = 13.91, c = 7.836, Z = 2; beta = 117.42° V = 1,398.08 Den(Calc)= 2.93
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Cm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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

Help on Cleavage: Cleavage: None
Help on Color: Color: Pale brown.
Help on Density: Density: 2.88
Help on Diaphaneity: Diaphaneity: Translucent to transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Neskevaaraite-Fe

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.82 gm/cc
note: Specific Gravity of Neskevaaraite-Fe =2.88 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PENeskevaaraite-Fe = 33.99 barns/electron
U=PENeskevaaraite-Fe x relectron= 95.72 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( CanMin, 24:1249) PHYS. PROP.(CanMin, 24:1249) OPTIC PROP.(CanMin, 24:1249)
Help on See Also: 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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Dana No: 60.01.03f.03 Strunz No: 09.CE.30h





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