Columbite-(Mn) Mineral Data

Advertisment

A Bijoux.com is an online store specialized in the sale on the internet of precious stones , gems , minerals and jewels for individuals and professionals

Your premier supplier of quality mineral specimens from Southern Africa and the world at large

Exceptional Minerals features excellent, high quality mineral specimens for sale. We also have a weekly Best Offer Mineral Auction.

Dakota Matrix was founded in 1996 and has offered systematic and rare mineral specimens online since 1998.

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, Döbschütz, Königshain, 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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Search for Columbite-(Mn) using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Columbite-(Mn) :

A Bijoux Google Search for Columbite-(Mn)
Adam's Minerals Google Search for Columbite-(Mn)
Cape Minerals Google Search for Columbite-(Mn)
Dakota Matrix Minerals Google Search for Columbite-(Mn)
Excalibur Mineral Corp. Google Search for Columbite-(Mn)
Exceptional Minerals Google Search for Columbite-(Mn)
John Betts Fine Minerals Search for Columbite-(Mn)
McDougall Minerals Google Search for Columbite-(Mn)
Mineral News Website Link
Rock and Mineral Shows Google Search for Columbite-(Mn)
Weinrich Minerals, Inc. Google Search for Columbite-(Mn)

Ask about Columbite-(Mn) 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 Español

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: