Mineralogy Database

Columbite-(Fe) Mineral Data

Search Webmineral :
  
Advertisment

General Columbite-(Fe) Information

Help on Chemical  Formula: Chemical Formula: Fe++Nb2O6
Help on Composition: Composition: Molecular Weight = 337.66 gm
   Niobium  55.03 %  Nb   78.72 % Nb2O5
   Iron     16.54 %  Fe   21.28 % FeO
   Oxygen   28.43 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+Nb2O6
Help on Environment: Environment: Pegmatites, and alluvial deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1802
Help on Locality: Locality: M'buye Mine, Rwanda. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its content of the element niobium, formerly called columbium and the Latin ferrium - "iron."
Help on Name Pronunciation: Name Pronunciation: Columbite-(Fe) + Pronunciation Say COLUMBITE-(FE)
Help on Synonym: Synonym: Coltan
  Columbite-Tantalite
  Ferrocolumbite - Renamed to Columbite-(Fe) by Mineralogical Record, v39 (2008), p 131
  Niobite
 

Columbite-(Fe) Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Columbite-(Fe)   Microcline

Comments: Blocky, dark brown ferrocolumbite on pale greenish blue amazonite (microcline).
Location: Crystal Park, El Paso Co., Colorado, USA. Scale: 2.5 x 1.5 cm.
© Fabre Minerals

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Baotite   Columbite-(Fe)

Comments: Minute brown crystalline grains of baotite in dark ferrocolumbite (columbite-(Fe)).
Location: Sheep Creek, Ravalli County, Montana. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Plumbopyrochlore   Columbite-(Fe)

Comments: Brown plumbopyrochlore crystal with dark brown ferrocolumbite (columbite-(Fe)).
Location: Holdazan, Buregteg, Mongolia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Columbite-(Fe)

Comments: Dark, coaly black, weathered granular ferrocolumbite. This specimen was originally identified as samarskite-(Y) and corrected by Fred Davis who studied the locality.
Location: Spinelli Samarskite Prospect, Glastonbury, Hartford Co., Connecticut, USA. Scale: Picture size 4 mm.
© Paul M. Schumacher

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Columbite-(Fe)

Comments: Dark grains of columbite-(Fe) wtth small brown grains of fluorcarbonates of LREE. Corrected identificaton by Pavel M. Kartashov who analyzed this occurrence of 'chagbaiite'.
Location: Round Top Rhyolite, Hudspeth County, Texas, USA. Scale: Picture Size 1 mm.
© Thomas Witzke

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Upalite   Columbite-(Fe)

Comments: Thin translucent yellowish upalite crusts on a prismatic, black columbite crystal.
Location: Thin translucent yellowish crusts on undifferntiated columbite crystal. Scale: Picture Size 2 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

Columbite-(Fe) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4015:1:0.3546
Help on Cell Dimensions: Cell Dimensions: a = 5.746, b = 14.308, c = 5.075, Z = 4; V = 417.23 Den(Calc)= 5.38
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): 2.977(1), 3.675(0.4), 1.726(0.16),
 

Physical Properties of Columbite-(Fe)

Help on Cleavage: Cleavage: {010} Distinct
Help on Color: Color: Black, Brownish black.
Help on Density: Density: 5.3 - 7.3, Average = 6.3
Help on Diaphaneity: Diaphaneity: Translucent to opaque
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: blackish brown
 

Optical Properties of Columbite-(Fe)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.149 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.25,KPDmeas= 0.2135,KC= 0.251
Ncalc = 2.33 - 2.83
Help on Optical Data: Optical Data: Biaxial (+), b=2.29-2.4
Help on RL Color: RL Color: Grayish white with a brownish tint and reddish internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Columbite-(Fe) in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   18.40   19.10 
   
 420 nm   17.70   18.60 
 440 nm   17.30   18.20 
 460 nm   17.10   17.90 
 480 nm   16.90   17.70 
 500 nm   16.90   17.60 
 520 nm   16.80   17.50 
 540 nm   16.80   17.40 
 560 nm   16.70   17.30 
 580 nm   16.70   17.20 
 600 nm   16.70   17.20 
 620 nm   16.60   17.10 
 640 nm   16.50   17.10 
 660 nm   16.40   16.90 
 680 nm   16.30   16.80 
 700 nm   16.10   16.80 
Calculated Relative Intensity Colors of Columbite-(Fe) in Air
Relative
Intensity
   0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 530%
R1                      
R2                      
 

Calculated Properties of Columbite-(Fe)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.97 gm/cc
note: Specific Gravity of Columbite-(Fe) =5.38 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0036428616
Boson Index = 0.9963571384
Help on Photoelectric: Photoelectric: PEColumbite-(Fe) = 89.38 barns/electron
U=PEColumbite-(Fe) x rElectron Density= 444.33 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Columbite-(Fe) is Not Radioactive
 

Columbite-(Fe) Classification

Help on  Dana Class: Dana Class: 08.03.02.02 (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 Columbite-(Fe) Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Columbite-(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

Search for Columbite-(Fe) using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Columbite-(Fe) :

Ask about Columbite-(Fe) 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 Espaņol

Print or Cut-and-Paste your Columbite-(Fe) Specimen Label here :

Columbite-(Fe)

Fe++Nb2O6
Dana No: 08.03.02.02 Strunz No: 04.DB.35
Locality:

 

Notes:

 

 
   
 


Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.