Mineralogy Database

Natrotantite Mineral Data

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General Natrotantite Information

Help on Chemical  Formula: Chemical Formula: Na2Ta4O11
Help on Composition: Composition: Molecular Weight = 945.76 gm
   Sodium     4.86 %  Na    6.55 % Na2O
   Tantalum  76.53 %  Ta   93.45 % Ta2O5
   Oxygen    18.61 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2Ta4O11
Help on Environment: Environment: Found in albite units of granite pegmatites. Rimming crystals of simpsonite and, in turn, rimmed by alumotantite.
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Leshaia pegmatite, Vuoriyarvi carbonatite complex, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for sodium, "NATRium", and TANTalum in the composition.
Help on Name Pronunciation: Name Pronunciation: Natrotantite + Pronunciation Say NATROTANTITE
Help on Synonym: Synonym: ICSD 201714
  PDF 38-391

Natrotantite Image

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Comments: BSE image of ferrotapiolite (1), natrotantite (2) and simsonite (3).
Location: Alto Cajazeiras, south of Junro do Serido, Paraibo, Brazil. Scale: See Image.
© Diederik Visser

Natrotantite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:5.89611
Help on Cell Dimensions: Cell Dimensions: a = 6.209, c = 36.609, Z = 6; V = 1,222.26 Den(Calc)= 7.71
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3-c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.02(1), 2.778(0.9), 1.556(0.8),

Physical Properties of Natrotantite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless.
Help on Density: Density: 7.705
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Hardness: Hardness: 7 - Quartz
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white

Optical Properties of Natrotantite

Help on Optical Data: Optical Data: Uniaxial (?).
  NCalc= 2.18 - from Gladstone-Dale relationship (KC = 0.1536) where Ncalc=Dcalc*KC+1
NCalc= 2.18 - from Gladstone-Dale relationship (KC = 0.1536) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Natrotantite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 486 nm   15.00   13.60 
 589 nm   12.40   11.80 
 656 nm   12.00   12.00 
Calculated Relative Intensity Colors of Natrotantite in Air
   0%   80% 100% 160% 240% 320% 400% 480% 560% 640% 720% 740%

Calculated Properties of Natrotantite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.55 gm/cc
note: Specific Gravity of Natrotantite =7.71 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.000181157
Boson Index = 0.999818843
Help on Photoelectric: Photoelectric: PENatrotantite = 927.13 barns/electron
U=PENatrotantite x rElectron Density=6,076.71 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Natrotantite is Not Radioactive

Natrotantite Classification

Help on  Dana Class: Dana Class: (08)Multiple Oxides with Nb, Ta, and Ti
  (08.06)Dana Type
  (08.06.02)Calciotantite Group Calciotantite Ca(Ta,Nb)4O11 P 6322 6 2 2 Natrotantite Na2Ta4O11 R 3-c 3 2/m Irtyshite Na2(Ta,Nb)4O11 P 63/m 6/m
Help on  Strunz Class: Strunz Class: 04.DJ.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DJ -With large (� medium-sized) cations; polyhedral frameworks
04.DJ.05 Calciotantite Ca(Ta,Nb)4O11 P 6322 6 2 2
04.DJ.05 Irtyshite Na2(Ta,Nb)4O11 P 63/m 6/m
04.DJ.05 Natrotantite Na2Ta4O11 R 3-c 3 2/m

Other Natrotantite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Natrotantite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 04.DJ.05





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