Tongbaite Mineral Data

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.

Name Pronunciation:

Tongbaite + Pronunciation

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.

Diaphaneity:

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:

Bulk Density (Electron Density)=6.21 gm/cc
note: Specific Gravity of Tongbaite =6.65 gm/cc.

Fermion Index:

Fermion Index = 0.08
Boson Index = 0.92

Photoelectric:

PE_Tongbaite= 19.96 barns/electron
U=PE_Tongbaite x rElectron Density= 123.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tongbaite is Not Radioactive

Tongbaite Classification

Dana Class:

01.01.17.01 (01)Native Elements

(01.01)with metallic elements other than the platinum group

(01.01.17)Dana Group

01.01.17.01 Tongbaite Cr3C2 P nma 2/m 2/m 2/m

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

01.01.17.03 Andreyivanovite! FeCrP P nma 2/m 2/m 2/m

Strunz Class:

01.BA.15 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.15 Tongbaite Cr3C2 P nma 2/m 2/m 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Tongbaite

Cr3C2
Dana No: 01.01.17.01 Strunz No: 01.BA.15
Locality:

Notes: