Natrotantite Mineral Data + Say NATROTANTITE


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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 Synonym: Synonym: ICSD 201714
  PDF 38-391
 

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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 ScalenohedralH-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 Diaphaniety: Diaphaniety: 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
Relative
Intensity		    0%   80% 100% 160% 240% 320% 400% 480% 560% 640% 720% 740%
R1                        
R2                        
 

Calculated Properties of Natrotantite

Help on Electron Density: Electron Density:

relectron=6.55 gm/cc
note: rNatrotantite =7.71 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00018
Boson Index = 0.99982
Help on Photoelectric: Photoelectric:

PENatrotantite = 927.13 barns/electron
U=PENatrotantite x relectron=6,076.70 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: 8.6.2.2 (8)Multiple Oxides with Nb, Ta, and Ti
  (8.6)Dana Type
  (8.6.2)Dana Group
 
8.6.2.1 Calciotantite Ca(Ta,Nb)4O11 P 6322 6 2 2
 
8.6.2.2 Natrotantite Na2Ta4O11 R 3-c 3 2/m
 
8.6.2.3 Irtyshite Na2(Ta,Nb)4O11 P 63/m 6/m
Help on Strunz Class: Strunz Class: IV/D.26-20 IV - Oxides
  IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)
  IV/D.26 - Lithiotantite - Cesplumtantite series
 
IV/D.26-10 Lithiotantite Li(Ta,Nb)3O8 P 21/c 2/m
 
IV/D.26-20 Natrotantite Na2Ta4O11 R 3-c 3 2/m
 
IV/D.26-30 Irtyshite Na2(Ta,Nb)4O11 P 63/m 6/m
 
IV/D.26-40 Calciotantite Ca(Ta,Nb)4O11 P 6322 6 2 2
 
IV/D.26-50 Ungursaite? NaCa5(Ta,Nb)24O65(OH) P 63/m,P 63 Hex
 
IV/D.26-60 Cesplumtantite (Cs,Na,Ca)2(Pb,Sb,Sn)3Ta8O24 Unk Tetra
 

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Natrotantite

Na2Ta4O11
Dana No: 8.6.2.2 Strunz No: IV/D.26-20
Locality:

 

Notes:

 
 
   
 
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