Columbite-(Mn) Mineral Data

General Columbite-(Mn) Information

Chemical Formula:

(Mn,Fe++)(Nb,Ta)2O6

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

Empirical Formula:

Mn²⁺_0.5Fe²⁺_0.5Nb_1.4Ta_0.6Ti_0.1O₆

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

Columbite-(Mn) Image

Images:

Columbite-(Mn)

Comments: Small brown tabular crystals of manganocolumbite in a pegmatite.
Location: Neuland Quarry, DÃ¶bschÃ¼tz, KÃ¶nigshain, Oberlausitz, Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

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

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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcan

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.991(1), 3.695(0.35), 1.7358(0.14),

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)

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

Optical Properties of Columbite-(Mn)

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

Pleochroism (x):

strong red.

Pleochroism (y):

red brown.

Pleochroism (z):

orange.

RL Color:

Grayish white with a brownish tint and reddish brown internal reflections.

Calculated Properties of Columbite-(Mn)

Electron Density:

Bulk Density (Electron Density)=5.56 gm/cc
note: Specific Gravity of Columbite-(Mn) =6.20 gm/cc.

Fermion Index:

Fermion Index = 0.0032171382
Boson Index = 0.9967828618

Photoelectric:

PE_{Columbite-(Mn)}= 372.39 barns/electron
U=PE_{Columbite-(Mn)} x rElectron Density=2,068.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Columbite-(Mn) is Not Radioactive

Columbite-(Mn) Classification

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

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

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 :

Columbite-(Mn)

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

Notes: