Tongbaite Mineral Data

Tongbaite Mineral Data +

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General Tongbaite Information

Chemical Formula:

Cr3C2

Composition:

Molecular Weight = 180.01 gm

Chromium 86.66 % Cr

Carbon 13.34 % C

______

100.00 %

Empirical Formula:

Cr₃C₂

Environment:

In ultramafic rocks.

IMA Status:

Approved IMA 1983

Locality:

Liu Zhuang, Tongbai County, Henan, China Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 15086

PDF 35-804

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Tongbaite Crystallography

Axial Ratios:

a:b:c =0.4856:1:0.2455

Cell Dimensions:

a = 5.57, b = 11.47, c = 2.816, Z = 4; V = 179.91 Den(Calc)= 6.65

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

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

By Intensity(I/I_o): 2.3(1), 2.23(0.8), 1.193(0.7),

Crystal Structure:

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Rundqvist S , Runnsjo G , Acta Chemica Scandinavica , 23 (1969) p.1191-1199, Crystal structure refinement of Cr3C2, Locality: synthetic, Note: values obtained from intensities recorded photographically

View Additional jPOWD Structure files for Tongbaite
[1]

Physical Properties of Tongbaite

Color:

Light brownish yellow.

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

8.5 - Chrysoberyl

Luster:

Metallic

Streak:

dark gray

Optical Properties of Tongbaite

Optical Data:

Biaxial (?)

RL Anisotrophism:

Strong, purplish yellow to yellow-orange.

RL Bireflectance:

Distinct.

RL Color:

Pale violet.

RL Pleochroism:

Distinct.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Tongbaite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
405 nm	46.54	49.10
436 nm	48.50	51.28
480 nm	51.14	53.86
526 nm	53.72	55.94
546 nm	54.68	56.89
578 nm	57.07	57.51
589 nm	57.38	57.82
622 nm	58.72	57.68
644 nm	60.33	59.02
656 nm	61.50	59.97
664 nm	61.56	59.97
700 nm	61.35	59.20

**Calculated Relative Intensity Colors of Tongbaite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%
R₁
R₂

Calculated Properties of Tongbaite

Electron Density:

r_electron=6.21 gm/cc
note: r_Tongbaite=6.65 gm/cc.

Fermion Index

Fermion Index = 0.08379
Boson Index = 0.91621

Photoelectric:

PE_Tongbaite= 19.96 barns/electron
U=PE_Tongbaite x r_electron= 123.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tongbaite is Not Radioactive

Tongbaite Classification

Dana Class:

1.1.17.1 (1)Native Elements

(1.1)with metallic elements other than the platinum group

(1.1.17)Dana Group

1.1.17.1 Tongbaite Cr3C2 P nma 2/m 2/m 2/m

1.1.17.2 Florenskyite! (Fe,Ni)TiP P nma 2/m 2/m 2/m

Strunz Class:

I/A.09-30 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 Tongbaite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Tongbaite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Tongbaite Specimen Label here :

Tongbaite

Cr3C2
Dana No: 1.1.17.1 Strunz No: I/A.09-30
Locality:

Notes: