Tantalite-(Mn) Mineral Data

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

Help on Chemical Formula: Chemical Formula: MnTa2O6
Help on Composition: Composition: Molecular Weight = 512.83 gm
   Tantalum   70.57 %  Ta   86.17 % Ta2O5
   Manganese  10.71 %  Mn   13.83 % MnO
   Oxygen     18.72 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+Ta2O6
Help on Environment: Environment: Pegmatites and alluvial deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1887
Help on Locality: Locality: Custer and Pennington Cos., South Dakota, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its chemical composition containing manganese and tantalum.
Help on Synonym: Synonym: Coltan
  Manganotantalite - Renamed to Tantalite-(Mn) by Mineralogical Record, v39 (2008), p 131
 

Tantalite-(Mn) Image

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Tantalite-(Mn)

Comments: Floater crystal of doubly terminated, brilliant, with a little red tint manganotantalite.
Location: Pech, Kunar, Afganistan. Scale: 5.5 x 7 cm.
© Fabre Minerals
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Tantalite-(Mn)   Calciotantite

Comments: SEM image showing calciotantite (CT), manganotatntalite (MTT), microlite (MT) and lithiowodginite (LW) association.
Location: Granitic pegmatites, Kalba, Kazakhstan. Scale: Scale bar 100 µm and 10 µm.
© Diederik Visser

Tantalite-(Mn) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.399:1:0.3523
Help on Cell Dimensions: Cell Dimensions: a = 5.772, b = 14.465, c = 5.097, Z = 4; V = 425.56 Den(Calc)= 8.00
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): 2.99(1), 3.69(0.9), 2.41(0.7),
Click Here for Large Tantalite-(Mn) Structure Window Crystal Structure:

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Klein S , Weitzel H , Acta Crystallographica, Section A , 32 (1976) p.587-591, Magnetische struktur von Mn(Nb0.5Ta0.5)2O6, manganotantalit, Note: columbite structure

 

Physical Properties of Tantalite-(Mn)

Help on Cleavage: Cleavage: {100} Imperfect
Help on Color: Color: Black, Brown.
Help on Density: Density: 8.1
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Disseminated - Occurs in small, distinct particles dispersed in matrix.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: brown
 

Optical Properties of Tantalite-(Mn)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.047 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1519,KPDmeas= 0.15,KC= 0.1574
Ncalc = 2.26 - 2.27
Help on Optical Data: Optical Data: Biaxial (+), a=2.14-2.19, b=2.15-2.25, g=2.22-2.34, bire=0.0800-0.1500
Help on Pleochroism (x): Pleochroism (x): red.
Help on Pleochroism (y): Pleochroism (y): red brown.
Help on Pleochroism (z): Pleochroism (z): orange.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Tantalite-(Mn) in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   15.50   16.40 
   
 420 nm   15.10   16.00 
 440 nm   14.80   15.70 
 460 nm   14.60   15.40 
 480 nm   14.30   15.20 
 500 nm   14.10   15.00 
 520 nm   13.90   14.80 
 540 nm   13.80   14.70 
 560 nm   13.60   14.50 
 580 nm   13.60   14.40 
 600 nm   13.50   14.40 
 620 nm   13.50   14.30 
 640 nm   13.40   14.30 
 660 nm   13.40   14.30 
 680 nm   13.30   14.20 
 700 nm   13.30   14.20 
Calculated Relative Intensity Colors of Tantalite-(Mn) in Air
Relative
Intensity		    0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 630% 650%
R1                        
R2                        
 

Calculated Properties of Tantalite-(Mn)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.83 gm/cc
note: Specific Gravity of Tantalite-(Mn) =8.00 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001745329
Boson Index = 0.9998254671
Help on Photoelectric: Photoelectric: PETantalite-(Mn) = 853.94 barns/electron
U=PETantalite-(Mn) x rElectron Density=5,834.70 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tantalite-(Mn) is Not Radioactive
 

Tantalite-(Mn) Classification
Help on Dana Class: Dana Class: 08.03.02.03 (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 Tantalite-(Mn) Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Tantalite-(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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Tantalite-(Mn)

MnTa2O6
Dana No: 08.03.02.03 Strunz No: 04.DB.35
Locality:

 

Notes: