Natrotantite Mineral Data

General Natrotantite Information

Chemical Formula:

Na2Ta4O11

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

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

PDF 38-391

Natrotantite Image

Images:

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

Natrotantite Crystallography

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 ScalenohedralH-M Symbol (3 2/m) Space Group: R 3-c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.02(1), 2.778(0.9), 1.556(0.8),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Ercit T S , Hawthorne F C , Cerny P , Bulletin de Mineralogie , 108 (1985) p.541-549, Locality: synthetic, The crystal structure of synthetic natrotantite

Physical Properties of Natrotantite

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

Optical Properties of Natrotantite

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

RL Anisotrophism:

Strong.

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

Electron Density:

Bulk Density (Electron Density)=6.55 gm/cc
note: Specific Gravity of Natrotantite =7.71 gm/cc.

Fermion Index:

Fermion Index = 0.000181157
Boson Index = 0.999818843

Photoelectric:

PE_Natrotantite= 927.13 barns/electron
U=PE_Natrotantite x rElectron Density=6,076.71 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Natrotantite is Not Radioactive

Natrotantite Classification

Dana Class:

08.06.02.02 (08)Multiple Oxides with Nb, Ta, and Ti

(08.06)Dana Type

(08.06.02)Calciotantite Group

08.06.02.01 Calciotantite Ca(Ta,Nb)4O11 P 6₃22 6 2 2

08.06.02.02 Natrotantite Na2Ta4O11 R 3-c 3 2/m

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

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

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

Search for Natrotantite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Natrotantite :

A Bijoux Google Search for Natrotantite
Adam's Minerals Google Search for Natrotantite
Cape Minerals Google Search for Natrotantite
Dakota Matrix Minerals Google Search for Natrotantite
Excalibur Mineral Corp. Google Search for Natrotantite
Exceptional Minerals Google Search for Natrotantite
John Betts Fine Minerals Search for Natrotantite
McDougall Minerals Google Search for Natrotantite
Mineral News Website Link
Rock and Mineral Shows Google Search for Natrotantite
Weinrich Minerals, Inc. Google Search for Natrotantite

Ask about Natrotantite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Natrotantite Specimen Label here :

Natrotantite

Na2Ta4O11
Dana No: 08.06.02.02 Strunz No: 04.DJ.05
Locality:

Notes: