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Columbite-(Mn) Mineral Data
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General Columbite-(Mn) Information
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 Chemical Formula: |
(Mn,Fe++)(Nb,Ta)2O6 |
| Composition: |
Molecular Weight = 394.81 gm |
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Tantalum 27.50 % Ta 33.58 % Ta2O5 |
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Titanium 1.21 % Ti 2.02 % TiO2 |
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Manganese 6.96 % Mn 8.98 % MnO |
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Niobium 32.94 % Nb 47.13 % Nb2O5 |
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Iron 7.07 % Fe 9.10 % FeO |
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Oxygen 24.31 % O |
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______ ______ |
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100.00 % 100.81 % = TOTAL OXIDE |
| Empirical Formula: |
Mn2+0.5Fe2+0.5Nb1.4Ta0.6Ti0.1O6 |
| Environment: |
Constituent of granitic pegmatites. |
| IMA Status: |
Valid Species (Pre-IMA) 1892 |
| Locality: |
Globe and Harding pegmatites, Taos County, New Mexico, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the MANGANese content and the relationship to columbite (ferrocolumbite). |
| Name Pronunciation: |
Columbite-(Mn) + Pronunciation  |
| Synonym: |
Manganocolumbite - Renamed to Columbite-(Mn) by Mineralogical Record, v39 (2008), p 131 |
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Columbite-(Mn) Image |
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Images:
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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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Images:
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Plumbopyrochlore Columbite-(Mn)
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 |
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Columbite-(Mn) Crystallography
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| Axial Ratios: |
a:b:c =0.3995:1:0.3522 |
| Cell Dimensions: |
a = 5.767, b = 14.434, c = 5.085, Z = 4; V = 423.28 Den(Calc)= 6.20 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pcan |
| X Ray Diffraction: |
By Intensity(I/Io): 2.991(1), 3.695(0.35), 1.7358(0.14), |
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Physical Properties of Columbite-(Mn)
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| Cleavage: |
{010} Distinct, {100} Indistinct |
| Color: |
Brownish black, Black. |
| Density: |
5.28 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Subconchoidal - Brittle frature with subconchoidal fragments |
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. |
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
| Habit: |
Tabular - Form dimensions are thin in one direction. |
| Hardness: |
6 - Orthoclase |
| Luster: |
Sub Metallic |
| Streak: |
reddish black |
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Optical Properties of Columbite-(Mn)
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| Optical Data: |
Biaxial (-) |
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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
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| Pleochroism (x): |
strong red. |
| Pleochroism (y): |
red brown. |
| Pleochroism (z): |
orange. |
| RL Color: |
Grayish white with a brownish tint and reddish brown internal reflections. |
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Calculated Properties of Columbite-(Mn)
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| Electron Density: |
Bulk Density (Electron Density)=5.56 gm/cc
note: Specific Gravity of Columbite-(Mn) =6.20 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0032171382
Boson Index = 0.9967828618 |
| Photoelectric: |
PEColumbite-(Mn) = 372.39 barns/electron
U=PEColumbite-(Mn) x rElectron Density=2,068.95 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Columbite-(Mn) is Not Radioactive |
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Columbite-(Mn) Classification
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| Dana Class: |
08.03.02.04 (08)Multiple Oxides with Nb, Ta, and Ti |
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(08.03)where A (B2O6) |
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(08.03.02)Tantalite - Columbite Series |
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08.03.02.01 Tantalite-(Fe) FeTa2O6 Pcan 2/m 2/m 2/m |
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08.03.02.02 Columbite-(Fe) FeNb2O6 Pcan 2/m 2/m 2/m |
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08.03.02.03 Tantalite-(Mn) MnTa2O6 Pcan 2/m 2/m 2/m |
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08.03.02.04 Columbite-(Mn) (Mn,Fe)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m |
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08.03.02.05 Columbite-(Mg) (Mg,Fe,Mn)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m |
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08.03.02.06 Tantalite-(Mg)! (Mg,Fe)(Ta,Nb)2O6 P bcn 2/m 2/m 2/m |
| Strunz Class: |
04.DB.35 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.D - Metal:Oxygen = 1:2 and similar |
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04.DB -With medium-sized cations; chains of edge-sharing octahedra |
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04.DB.35 Columbite-(Mg) (Mg,Fe,Mn)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m |
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04.DB.35 Tantalite-(Fe) FeTa2O6 Pcan 2/m 2/m 2/m |
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04.DB.35 Columbite-(Fe) FeNb2O6 Pcan 2/m 2/m 2/m |
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04.DB.35 Columbite-(Mn) (Mn,Fe)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m |
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04.DB.35 Qitianlingite Fe2Nb2WO10 P bcn 2/m 2/m 2/m |
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04.DB.35 Tantalite-(Mn) MnTa2O6 Pcan 2/m 2/m 2/m |
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04.DB.35 Tantalite-(Mg)! (Mg,Fe)(Ta,Nb)2O6 P bcn 2/m 2/m 2/m |
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Other Columbite-(Mn) Information
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| References: |
NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3) |
| See Also: |
Links to other databases for Columbite-(Mn) :
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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Print or Cut-and-Paste your Columbite-(Mn) Specimen Label here :
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Columbite-(Mn)
(Mn,Fe++)(Nb,Ta)2O6
Dana No: 08.03.02.04 Strunz No: 04.DB.35
Locality:
Notes:
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