Ferrocolumbite Mineral Data + Say FERROCOLUMBITE

General Ferrocolumbite 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 Synonym: Synonym: Coltan
  Columbite
  Columbite-Tantalite
  ICSD 71052
  Niobite
  PDF 33-659
 

Ferrocolumbite Image

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Ferrocolumbite   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
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Ferrocolumbite   Baotite

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

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

Ferrocolumbite 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 - DipyramidalH-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),
Help on Forms: Forms:

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Forms: [ 1 3 1] [ 0 1 0] [ 1 7 0] [ 1 1 1] [ 1 3 0] [ 0 1 1]

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Wenger M , Armbruster T , Geiger C A , American Mineralogist , 76 (1991) p.1897-1904, Cation distribution in partially ordered columbite from the Kings Mountain, pegmatite, North Carolina, sample NCP5, T = 100 K

View Additional jPOWD Structure files for Ferrocolumbite
[1] [10] [11] [12] [13] [14] [15] [2] [3] [4] [5] [6] [7] [8] [9]
 

Physical Properties of Ferrocolumbite

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 Diaphaniety: Diaphaniety: 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 Ferrocolumbite

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
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 Ferrocolumbite 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 Ferrocolumbite in Air
Relative
Intensity		    0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 530%
R1                      
R2                      
 

Calculated Properties of Ferrocolumbite

Help on Electron Density: Electron Density:

relectron=4.97 gm/cc
note: rFerrocolumbite =5.38 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00364
Boson Index = 0.99636
Help on Photoelectric: Photoelectric:

PEFerrocolumbite = 89.38 barns/electron
U=PEFerrocolumbite x relectron= 444.33 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferrocolumbite is Not Radioactive
 

Ferrocolumbite Classification
Help on Dana Class: Dana Class: 8.3.2.2 (8)Multiple Oxides with Nb, Ta, and Ti
  (8.3)where A (B2O6)
  (8.3.2)Dana Group
 
8.3.2.1 Ferrotantalite FeTa2O6 Pcan 2/m 2/m 2/m
 
8.3.2.2 Ferrocolumbite FeNb2O6 Pcan 2/m 2/m 2/m
 
8.3.2.3 Manganotantalite MnTa2O6 Pcan 2/m 2/m 2/m
 
8.3.2.4 Manganocolumbite (Mn,Fe)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
8.3.2.5 Magnesiocolumbite (Mg,Fe,Mn)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
8.3.2.6 Magnesiotantalite! (Mg,Fe)(Ta,Nb)2O6 P bcn 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: IV/D.18-30 IV - Oxides
  IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)
  IV/D.18 - Columbite series
 
IV/D.18-10 Magnesiocolumbite (Mg,Fe,Mn)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
IV/D.18-20 Manganocolumbite (Mn,Fe)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
IV/D.18-30 Ferrocolumbite FeNb2O6 Pcan 2/m 2/m 2/m
 
IV/D.18-35 Magnesiotantalite! (Mg,Fe)(Ta,Nb)2O6 P bcn 2/m 2/m 2/m
 
IV/D.18-40 Manganotantalite MnTa2O6 Pcan 2/m 2/m 2/m
 
IV/D.18-50 Ferrotantalite FeTa2O6 Pcan 2/m 2/m 2/m
 

Other Ferrocolumbite 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 Ferrocolumbite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 -Google Images 8 -Google Scholar 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 - Philatelic Mineralogy 15 -QUT Mineral Atlas 16 -École des Mines de Paris

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Ferrocolumbite

Fe++Nb2O6
Dana No: 8.3.2.2 Strunz No: IV/D.18-30
Locality:

 

Notes:

 
 
   
 
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