Magnesiotantalite Mineral Data


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General Magnesiotantalite Information
Help on Chemical Formula: Chemical Formula: (Mg,Fe)(Ta,Nb)2O6
Help on Composition: Composition: Molecular Weight = 425.25 gm
   Magnesium   3.20 %  Mg    5.31 % MgO
   Tantalum   51.06 %  Ta   62.35 % Ta2O5
   Titanium    0.23 %  Ti    0.38 % TiO2
   Manganese   0.65 %  Mn    0.83 % MnO
   Niobium    17.04 %  Nb   24.38 % Nb2O5
   Iron        5.25 %  Fe    6.76 % FeO
   Oxygen     22.57 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg0.56Fe2+0.4Mn2+0.05Ta1.2Nb0.78Ti0.02O6
Help on Environment: Environment: Intergrown with ferrotantalie, ferrocolumbite as replacement rims on manganotantilite crystals in a de-silicified granitic pegmatite. Columbite-tantalite group.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Lipovka pegmatite field, Rezh district, Central Urals, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the magnesium-dominant member of the tantalite series.
Help on Synonym: Synonym: IMA2002-018
 

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Magnesiotantalite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =2.503:1:0.8819
Help on Cell Dimensions: Cell Dimensions: a = 14.355, b = 5.735, c = 5.058, Z = 4; V = 416.40 Den(Calc)= 6.78
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P bcn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.96(1)(311), 1.462(0.9)(332), 1.728(0.7)(621),1.105(0.6), 1.196(0.6), 1.774(0.6)(330), 3.67(0.6)(310,111),
 

Physical Properties of Magnesiotantalite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Density: Density: 6.7
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: brown red
 

Optical Properties of Magnesiotantalite

Help on Optical Data: Optical Data: NCalc= 2.26 - from Gladstone-Dale relationship (KC = 0.1859) where Ncalc=Dcalc*KC+1
NCalc= 2.25 - from Gladstone-Dale relationship (KC = 0.1859) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Weak.
Help on RL Bireflectance: RL Bireflectance: Very weak.
Help on RL Color: RL Color: Light gray with brownish red internal reflections in air.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Magnesiotantalite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   15.20   14.02 
   
 410 nm   15.18   13.69 
 420 nm   15.05   13.49 
 430 nm   14.79   13.27 
 440 nm   14.73   12.95 
 450 nm   14.28   12.76 
 460 nm   13.97   12.82 
 470 nm   13.75   12.95 
 480 nm   13.58   13.05 
 490 nm   13.44   13.13 
 500 nm   13.33   13.20 
 510 nm   13.25   13.22 
 520 nm   13.23   13.19 
 530 nm   13.25   13.18 
 540 nm   13.33   13.20 
 546 nm   13.14   13.19 
 550 nm   13.47   13.28 
 560 nm   13.67   13.45 
 570 nm   13.94   13.67 
 580 nm   14.25   13.94 
 589 nm   14.57   14.24 
 590 nm   14.58   14.25 
 600 nm   14.90   14.58 
 610 nm   15.18   14.90 
 620 nm   15.41   15.16 
 630 nm   15.56   15.32 
 640 nm   15.61   15.31 
 650 nm   15.55   15.15 
 660 nm   15.41   14.83 
 670 nm   15.22   14.48 
 680 nm   15.00   14.12 
 690 nm   14.88   13.97 
 700 nm   14.76   13.76 
Calculated Relative Intensity Colors of Magnesiotantalite in Air
Relative
Intensity		    0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 630% 670%
R1                        
R2                        
 

Calculated Properties of Magnesiotantalite

Help on Electron Density: Electron Density:

relectron=5.94 gm/cc
note: rMagnesiotantalite =6.78 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00477
Boson Index = 0.99523
Help on Photoelectric: Photoelectric:

PEMagnesiotantalite = 629.35 barns/electron
U=PEMagnesiotantalite x relectron=3,740.44 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Magnesiotantalite is Not Radioactive
 

Magnesiotantalite Classification
Help on Dana Class: Dana Class: 8.3.2.6 (8)Multiple Oxides with Nb, Ta, and Ti
  (8.3)where A (B2O6)
  (8.3.2)Dana Group
 
8.3.2.1 Ferrotantalite FeTa2O6 Pcan 2/m 2/m 2/m
 
8.3.2.2 Ferrocolumbite FeNb2O6 Pcan 2/m 2/m 2/m
 
8.3.2.3 Manganotantalite MnTa2O6 Pcan 2/m 2/m 2/m
 
8.3.2.4 Manganocolumbite (Mn,Fe)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
8.3.2.5 Magnesiocolumbite (Mg,Fe,Mn)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
8.3.2.6 Magnesiotantalite ! (Mg,Fe)(Ta,Nb)2O6 P bcn 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: IV/D.18-35 IV - Oxides
  IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)
  IV/D.18 - Columbite series
 
IV/D.18-10 Magnesiocolumbite (Mg,Fe,Mn)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
IV/D.18-20 Manganocolumbite (Mn,Fe)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
IV/D.18-30 Ferrocolumbite FeNb2O6 Pcan 2/m 2/m 2/m
 
IV/D.18-35 Magnesiotantalite (Mg,Fe)(Ta,Nb)2O6 P bcn 2/m 2/m 2/m
 
IV/D.18-40 Manganotantalite MnTa2O6 Pcan 2/m 2/m 2/m
 
IV/D.18-50 Ferrotantalite FeTa2O6 Pcan 2/m 2/m 2/m
 

Other Magnesiotantalite Information
Help on References: References: NAME( AmMin, 89:468) PHYS. PROP.(AmMin, 89:468) OPTIC PROP.(MinRec, 35:357)
Help on See Also: See Also: Links to other databases for Magnesiotantalite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Magnesiotantalite

(Mg,Fe)(Ta,Nb)2O6
Dana No: 8.3.2.6 Strunz No: IV/D.18-35
Locality:

 

Notes:

 
 
   
 
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