Niobocarbide Mineral Data

Niobocarbide Mineral Data +

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General Niobocarbide Information

Chemical Formula:

(Nb,Ta)C

Composition:

Molecular Weight = 147.18 gm

Tantalum 59.01 % Ta

Niobium 32.83 % Nb

Carbon 8.16 % C

______

100.00 %

Empirical Formula:

Nb_0.52Ta_0.48C

Environment:

In platinum placer concentrates. The niobium-dominant analogue of tantalcarbide.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Nihnetagilsky, near Solovjeva mountain (formerly Aurorinsky mine) and Baranchinsky massif near the Actai River, Middle Urals, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after its composition of Nb and C.

Synonym:

ICSD 77217

IMA1995-035

PDF 51-1421

Niobocarbide Image

Images:

Niobocarbide

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

Cell Dimensions:

a = 4.45, Z = 4; V = 88.12 Den(Calc)= 11.09

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m

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

By Intensity(I/I_o): 2.56(1), 2.22(0.9), 1.574(0.8),

Crystal Structure:

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Wyckoff R W G , Crystal Structures , 1 (1963) p.85-237, Second edition. Interscience Publishers, New York, New York, rocksalt structure

Physical Properties of Niobocarbide

Color:

Yellow, Straw yellow.

Density:

10.25

Diaphaniety:

Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Inclusions - Generally found as inclusions in other minerals.

Hardness:

8 - Topaz

Luster:

Metallic

Optical Properties of Niobocarbide

RL Color:

Yellowish to rose cream.

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**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	270%	280%
R

Calculated Properties of Niobocarbide

Electron Density:

r_electron=9.40 gm/cc
note: r_Niobocarbide=11.1 gm/cc.

Fermion Index

Fermion Index = 0.00096
Boson Index = 0.99904

Photoelectric:

PE_Niobocarbide= 771.77 barns/electron
U=PE_Niobocarbide x r_electron=7,252.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Niobocarbide is Not Radioactive

Niobocarbide Classification

Dana Class:

1.1.19.3 (1)Native Elements

(1.1)with metallic elements other than the platinum group

(1.1.19)Dana Group

1.1.19.1 Osbornite TiN F m3m 4/m 3 2/m

1.1.19.2 Khamrabaevite (Ti,V,Fe)C F m3m 4/m 3 2/m

1.1.19.3 Niobocarbide ! (Nb,Ta)C F m3m 4/m 3 2/m

1.1.19.4 Tantalcarbide! TaC F m3m 4/m 3 2/m

Strunz Class:

I/A.09-55 I - Elements

I/A - Metallic and intermetallic compounds, Carbides, Nitrides, Phosphides and Silicides

I/A.09 - Honquiite-Tantalcarbide series

I/A.09-10 Hongquiite* TiO F m3m 4/m 3 2/m

I/A.09-20 Khamrabaevite (Ti,V,Fe)C F m3m 4/m 3 2/m

I/A.09-30 Tongbaite Cr3C2 P nma 2/m 2/m 2/m

I/A.09-35 Isovite! (Cr,Fe)23C6 F m3m 4/m 3 2/m

I/A.09-40 Haxonite (Fe,Ni)23C6 F m3m 4/m 3 2/m

I/A.09-50 Cohenite (Fe,Ni,Co)3C Pbnm 2/m 2/m 2/m

I/A.09-55 Niobocarbide (Nb,Ta)C F m3m 4/m 3 2/m

I/A.09-60 Tantalcarbide! TaC F m3m 4/m 3 2/m

Other Niobocarbide Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.83,p1117,1998) OPTIC PROP.(MinRec, v 29, p 475)

See Also:

Links to other databases for Niobocarbide :
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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Niobocarbide

(Nb,Ta)C
Dana No: 1.1.19.3 Strunz No: I/A.09-55
Locality:

Notes: