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Tantalite-(Fe) Mineral Data

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General Tantalite-(Fe) Information

Help on Chemical  Formula: Chemical Formula: Fe++Ta2O6
Help on Composition: Composition: Molecular Weight = 513.74 gm
   Tantalum  70.44 %  Ta   86.02 % Ta2O5
   Iron      10.87 %  Fe   13.98 % FeO
   Oxygen    18.69 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+Ta2O6
Help on Environment: Environment: Accessory mineral in granite pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1989
Help on Locality: Locality: Upper Bear Gulch, Lawrence Co, South Dakota, USA Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the FERROus iron and from the Greek, Tantalos = father of Niobe.
Help on Synonym: Synonym: Coltan
  Columbite-Tantalite
  Ferrotantalite - Renamed to Tantalite-(Fe) by Mineralogical Record, v39 (2008), p 131
 

Tantalite-(Fe) Image

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  Tantalite-(Fe)

Comments: Rounded black crystal of ferrotantalite.
Location: Mount Surprise, Queensland, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Tantalite-(Fe)

Comments: Blocky, crystalline aggregate of ferrotantalite crystals weighing over one kilogram.
Location: Ecuador, Minas Gerais, Brazil. Scale: 10 x 6 x 5 cm.
© Rob Lavinsky

Tantalite-(Fe) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4023:1:0.3567
Help on Cell Dimensions: Cell Dimensions: a = 5.73, b = 14.24, c = 5.08, Z = 4; V = 414.50 Den(Calc)= 8.23
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pcan
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.96(1), 3.66(0.5), 1.721(0.2),
 

Physical Properties of Tantalite-(Fe)

Help on Cleavage: Cleavage: {010} Distinct
Help on Color: Color: Brownish black, Black.
Help on Density: Density: 8.2
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: black brown
 

Optical Properties of Tantalite-(Fe)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.052 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.048 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1636,KPDmeas= 0.1642,KC= 0.1562
Ncalc = 2.28 - 2.29
Help on Optical Data: Optical Data: Biaxial (+), a=2.26, b=2.3-2.4, g=2.43, bire=0.1700
 

Calculated Properties of Tantalite-(Fe)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=7.05 gm/cc
note: Specific Gravity of Tantalite-(Fe) =8.23 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0024788106
Boson Index = 0.9975211894
Help on Photoelectric: Photoelectric: PETantalite-(Fe) = 850.67 barns/electron
U=PETantalite-(Fe) x rElectron Density=5,996.10 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tantalite-(Fe) is Not Radioactive
 

Tantalite-(Fe) Classification

Help on  Dana Class: Dana Class: 08.03.02.01 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.03)where A (B2O6)
  (08.03.02)Tantalite - Columbite Series
 
08.03.02.01 Tantalite-(Fe) FeTa2O6 Pcan 2/m 2/m 2/m
 
08.03.02.02 Columbite-(Fe) FeNb2O6 Pcan 2/m 2/m 2/m
 
08.03.02.03 Tantalite-(Mn) MnTa2O6 Pcan 2/m 2/m 2/m
 
08.03.02.04 Columbite-(Mn) (Mn,Fe)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
08.03.02.05 Columbite-(Mg) (Mg,Fe,Mn)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
08.03.02.06 Tantalite-(Mg)! (Mg,Fe)(Ta,Nb)2O6 P bcn 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.DB.35 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DB -With medium-sized cations; chains of edge-sharing octahedra
 
04.DB.35 Columbite-(Mg) (Mg,Fe,Mn)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
04.DB.35 Tantalite-(Fe) FeTa2O6 Pcan 2/m 2/m 2/m
 
04.DB.35 Columbite-(Fe) FeNb2O6 Pcan 2/m 2/m 2/m
 
04.DB.35 Columbite-(Mn) (Mn,Fe)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
04.DB.35 Qitianlingite Fe2Nb2WO10 P bcn 2/m 2/m 2/m
 
04.DB.35 Tantalite-(Mn) MnTa2O6 Pcan 2/m 2/m 2/m
 
04.DB.35 Tantalite-(Mg)! (Mg,Fe)(Ta,Nb)2O6 P bcn 2/m 2/m 2/m
 

Other Tantalite-(Fe) Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Tantalite-(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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Tantalite-(Fe)

Fe++Ta2O6
Dana No: 08.03.02.01 Strunz No: 04.DB.35
Locality:

 

Notes:

 

 
   
 


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