Mineralogy Database

Niobocarbide Mineral Data

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General Niobocarbide Information

Help on Chemical  Formula: Chemical Formula: (Nb,Ta)C
Help on Composition: Composition: Molecular Weight = 147.18 gm
   Tantalum  59.01 %  Ta
   Niobium   32.83 %  Nb
   Carbon     8.16 %  C
            100.00 % 
Help on Empirical Formula: Empirical Formula: Nb0.52Ta0.48C
Help on Environment: Environment: In platinum placer concentrates. The niobium-dominant analogue of tantalcarbide.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Nihnetagilsky, near Solovjeva mountain (formerly Aurorinsky mine) and Baranchinsky massif near the Actai River, Middle Urals, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its composition of Nb and C.
Help on Name Pronunciation: Name Pronunciation: Niobocarbide + Pronunciation Say NIOBOCARBIDE
Help on Synonym: Synonym: ICSD 77217
  PDF 51-1421

Niobocarbide Image

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Comments: Small metallic grain of niobocarbide.
Location: Nizhne-Tagil'skoye (Mednorudyanskoye) Cu Deposit, Nizhnii Tagil, Sverdlovskaya Oblast', Urals Region, Russia. Scale: Grain size 0.3 mm.
© Thomas Witzke / Abraxas-Verlag

Niobocarbide Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 4.45, Z = 4; V = 88.12 Den(Calc)= 11.09
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.56(1), 2.22(0.9), 1.574(0.8),

Physical Properties of Niobocarbide

Help on Color: Color: Yellow, Straw yellow.
Help on Density: Density: 10.25
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Hardness: Hardness: 8 - Topaz
Help on Luster: Luster: Metallic

Optical Properties of Niobocarbide

Help on RL Color: RL Color: Yellowish to rose cream.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Niobocarbide in Air
λ R  ∑ R(λ) 
 460 nm   31.80   
 540 nm   38.50 
 580 nm   45.10 
 660 nm   51.50 
Calculated Relative Intensity Colors of Niobocarbide in Air
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 270% 280%

Calculated Properties of Niobocarbide

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=9.40 gm/cc
note: Specific Gravity of Niobocarbide =11.1 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0009685161
Boson Index = 0.9990314839
Help on Photoelectric: Photoelectric: PENiobocarbide = 771.76 barns/electron
U=PENiobocarbide x rElectron Density=7,252.90 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Niobocarbide is Not Radioactive

Niobocarbide Classification

Help on  Dana Class: Dana Class: (01)Native Elements
  (01.01)with metallic elements other than the platinum group
  (01.01.19)Osbornite group carbides and nitrides Osbornite TiN F m3m 4/m 3 2/m Khamrabaevite (Ti,V,Fe)C F m3m 4/m 3 2/m Niobocarbide! (Nb,Ta)C F m3m 4/m 3 2/m Tantalcarbide! TaC F m3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 01.BA.20 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
  01.B - Metallic Carbides, Silicides, Nitrides and Phosphides
  01.BA -Carbides
01.BA.20 Khamrabaevite (Ti,V,Fe)C F m3m 4/m 3 2/m
01.BA.20 Niobocarbide! (Nb,Ta)C F m3m 4/m 3 2/m
01.BA.20 Tantalcarbide! TaC F m3m 4/m 3 2/m

Other Niobocarbide Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.83,p1117,1998) OPTIC PROP.(MinRec, v 29, p 475)
Help on See Also: See Also: Links to other databases for Niobocarbide :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 01.BA.20





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