Columbite-(Mn) Mineral Data

Columbite-(Mn) Mineral Data
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General Columbite-(Mn) Information

Help on Chemical Formula: Chemical Formula: (Mn,Fe++)(Nb,Ta)2O6
Help on Composition: Composition: Molecular Weight = 394.81 gm
   Tantalum   27.50 %  Ta   33.58 % Ta2O5
   Titanium    1.21 %  Ti    2.02 % TiO2
   Manganese   6.96 %  Mn    8.98 % MnO
   Niobium    32.94 %  Nb   47.13 % Nb2O5
   Iron        7.07 %  Fe    9.10 % FeO
   Oxygen     24.31 %  O
             ______        ______ 
             100.00 %      100.81 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+0.5Fe2+0.5Nb1.4Ta0.6Ti0.1O6
Help on Environment: Environment: Constituent of granitic pegmatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1892
Help on Locality: Locality: Globe and Harding pegmatites, Taos County, New Mexico, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the MANGANese content and the relationship to columbite (ferrocolumbite).
Help on Name Pronunciation: Name Pronunciation: Columbite-(Mn) + Pronunciation Say COLUMBITE-(MN)
Help on Synonym: Synonym: Manganocolumbite - Renamed to Columbite-(Mn) by Mineralogical Record, v39 (2008), p 131
 

Columbite-(Mn) Image

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Columbite-(Mn)

Comments: Small brown tabular crystals of manganocolumbite in a pegmatite.
Location: Neuland Quarry, Döbschütz, Königshain, Oberlausitz, Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag
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Columbite-(Mn)   Plumbopyrochlore

Comments: Yellow-brown plumbopyrochlore crystalline crust over black manganocolumbite grain. Such plumbopyrochlore-manganocolumbite ovoids with different grade of replacement are very typical for the locality.
Location: Amazonite pegmatites of Ploskaya Mt, Western Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture Size 12x10 mm.
© Pavel M. Kartashov

Columbite-(Mn) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.3995:1:0.3522
Help on Cell Dimensions: Cell Dimensions: a = 5.767, b = 14.434, c = 5.085, Z = 4; V = 423.28 Den(Calc)= 6.20
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): 2.991(1), 3.695(0.35), 1.7358(0.14),
Click Here for Large Columbite-(Mn) Structure Window Crystal Structure:

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Tarantino S C , Zema M , Pistorino M , Domeneghetti M C , Physics and Chemistry of Minerals , 30 (2003) p.590-598, High-temperature X-ray investigation of natural columbites, Note: sample KRA5 at T = 600 C, Sample: Kragero, Norway

 

Physical Properties of Columbite-(Mn)

Help on Cleavage: Cleavage: {010} Distinct, {100} Indistinct
Help on Color: Color: Brownish black, Black.
Help on Density: Density: 5.28
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Subconchoidal - Brittle frature with subconchoidal fragments
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: reddish black
 

Optical Properties of Columbite-(Mn)

Help on Optical Data: Optical Data: Biaxial (-)
  NCalc= 2.36 - from Gladstone-Dale relationship (KC = 0.2198) where Ncalc=Dcalc*KC+1
NCalc= 2.16 - from Gladstone-Dale relationship (KC = 0.2198) where Ncalc=Dmeas*KC+1
Help on Pleochroism (x): Pleochroism (x): strong red.
Help on Pleochroism (y): Pleochroism (y): red brown.
Help on Pleochroism (z): Pleochroism (z): orange.
Help on RL Color: RL Color: Grayish white with a brownish tint and reddish brown internal reflections.
 

Calculated Properties of Columbite-(Mn)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.56 gm/cc
note: Specific Gravity of Columbite-(Mn) =6.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0032171382
Boson Index = 0.9967828618
Help on Photoelectric: Photoelectric: PEColumbite-(Mn) = 372.39 barns/electron
U=PEColumbite-(Mn) x rElectron Density=2,068.95 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Columbite-(Mn) is Not Radioactive
 

Columbite-(Mn) Classification
Help on Dana Class: Dana Class: 08.03.02.04 (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-(Mn) Information
Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Columbite-(Mn) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Columbite-(Mn)

(Mn,Fe++)(Nb,Ta)2O6
Dana No: 08.03.02.04 Strunz No: 04.DB.35
Locality:

 

Notes: