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Natrotantite Mineral Data
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General Natrotantite Information
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 Chemical Formula: |
Na2Ta4O11 |
| Composition: |
Molecular Weight = 945.76 gm |
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Sodium 4.86 % Na 6.55 % Na2O |
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Tantalum 76.53 % Ta 93.45 % Ta2O5 |
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Oxygen 18.61 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Na2Ta4O11 |
| Environment: |
Found in albite units of granite pegmatites. Rimming crystals of simpsonite and, in turn, rimmed by alumotantite. |
| IMA Status: |
Approved IMA 1981 |
| Locality: |
Leshaia pegmatite, Vuoriyarvi carbonatite complex, Kola Peninsula, Russia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for sodium, "NATRium", and TANTalum in the composition. |
| Name Pronunciation: |
Natrotantite + Pronunciation  |
| Synonym: |
ICSD 201714 |
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PDF 38-391 |
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Natrotantite Image |
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Images:
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Natrotantite
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 |
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Natrotantite Crystallography
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| Axial Ratios: |
a:c = 1:5.89611 |
| Cell Dimensions: |
a = 6.209, c = 36.609, Z = 6; V = 1,222.26 Den(Calc)= 7.71 |
| Crystal System: |
Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3-c |
| X Ray Diffraction: |
By Intensity(I/Io): 3.02(1), 2.778(0.9), 1.556(0.8), |
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Physical Properties of Natrotantite
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| Cleavage: |
None |
| Color: |
Colorless. |
| Density: |
7.705 |
| Diaphaneity: |
Transparent |
| Fracture: |
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. |
| Hardness: |
7 - Quartz |
| Luster: |
Adamantine |
| Streak: |
white |
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Optical Properties of Natrotantite
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| Optical Data: |
Uniaxial (?). |
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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
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| RL Anisotrophism: |
Strong. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Natrotantite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 486 nm |
15.00 |
13.60 |
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| 589 nm |
12.40 |
11.80 |
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| 656 nm |
12.00 |
12.00 |
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Calculated Relative Intensity Colors of Natrotantite in Air
Relative
Intensity |
0% |
80% |
100% |
160% |
240% |
320% |
400% |
480% |
560% |
640% |
720% |
740% |
| R1 |
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| R2 |
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Calculated Properties of Natrotantite
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| Electron Density: |
Bulk Density (Electron Density)=6.55 gm/cc
note: Specific Gravity of Natrotantite =7.71 gm/cc.
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| Fermion Index: |
Fermion Index = 0.000181157
Boson Index = 0.999818843 |
| Photoelectric: |
PENatrotantite = 927.13 barns/electron
U=PENatrotantite x rElectron Density=6,076.71 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Natrotantite is Not Radioactive |
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Natrotantite Classification
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| Dana Class: |
08.06.02.02 (08)Multiple Oxides with Nb, Ta, and Ti |
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(08.06)Dana Type |
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(08.06.02)Calciotantite Group |
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08.06.02.01 Calciotantite Ca(Ta,Nb)4O11 P 6322 6 2 2 |
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08.06.02.02 Natrotantite Na2Ta4O11 R 3-c 3 2/m |
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08.06.02.03 Irtyshite Na2(Ta,Nb)4O11 P 63/m 6/m |
| Strunz Class: |
04.DJ.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.D - Metal:Oxygen = 1:2 and similar |
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04.DJ -With large (� medium-sized) cations; polyhedral frameworks |
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04.DJ.05 Calciotantite Ca(Ta,Nb)4O11 P 6322 6 2 2 |
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04.DJ.05 Irtyshite Na2(Ta,Nb)4O11 P 63/m 6/m |
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04.DJ.05 Natrotantite Na2Ta4O11 R 3-c 3 2/m |
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Other Natrotantite Information
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| References: |
NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3) |
| 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
15 - WWW-MINCRYST
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Natrotantite
Na2Ta4O11
Dana No: 08.06.02.02 Strunz No: 04.DJ.05
Locality:
Notes:
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