Changchengite Mineral Data

General Changchengite Information

Chemical Formula:

IrBiS

Composition:

Molecular Weight = 433.27 gm

Bismuth 48.23 % Bi

Iridium 44.37 % Ir

Sulfur 7.40 % S

______

100.00 %

Empirical Formula:

IrBiS

Environment:

Pt placer deposits derived from the host chromite ore bodies in dunite.

IMA Status:

Approved IMA 1997 (Dana # Added)

Locality:

Along a branch of the Luanhe River in Hebei Province, about 200 km ENE of Beijing, China. Link to MinDat.org Location Data.

Name Origin:

Named after chancheng, the name of the "Great Wall" of China.

Synonym:

IMA1995-047

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Changchengite Crystallography

Cell Dimensions:

a = 6.144, Z = 4; V = 231.93 Den(Calc)= 12.41

Crystal System:

Isometric - TetartoidalH-M Symbol (2 3) Space Group: P 2₁3

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

By Intensity(I/I_o): 1.86(1), 2.75(0.7), 2.51(0.6),

Physical Properties of Changchengite

Cleavage:

None

Color:

Gray, Black.

Density:

11.96 - 12.27, Average = 12.11

Diaphaneity:

Opaque

Fracture:

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

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

3.5 - Copper Penny

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

black

Optical Properties of Changchengite

RL Color:

Bright white with a yellowish tint.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Changchengite in Air**
λ	R	∑ R(λ)
470 nm	46.20
550 nm	47.20
590 nm	47.60
650 nm	47.40

**Calculated Relative Intensity Colors of Changchengite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R

Calculated Properties of Changchengite

Electron Density:

Bulk Density (Electron Density)=10.1 gm/cc
note: Specific Gravity of Changchengite =12.4 gm/cc.

Fermion Index:

Fermion Index = 0.0005555565
Boson Index = 0.9994444435

Photoelectric:

PE_{Changchengite}=1,632.42 barns/electron
U=PE_{Changchengite} x rElectron Density=16458.55 barns/cc.

Radioactivity:

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

Changchengite Classification

Dana Class:

02.12.03.14 (02)Sulfides - Including Selenides and Tellurides

(02.12)where Am Bn Xp, with (m+n):p=1:2

(02.12.03)Cobaltite Group (Cubic or pseudocubic crystals)

02.12.03.01 Cobaltite CoAsS P ca2₁ mm2

02.12.03.02 Gersdorffite NiAsS P 2₁3 2 3

02.12.03.03 Ullmannite NiSbS P 2₁3 2 3

02.12.03.04 Willyamite (Co,Ni)SbS P 2₁3 2 3

02.12.03.05 Tolovkite IrSbS P 2₁3 2 3

02.12.03.06 Platarsite (Pt,Rh,Ru)AsS P a3 2/m 3

02.12.03.07 Irarsite (Ir,Ru,Rh,Pt)AsS P a3 2/m 3

02.12.03.08 Hollingworthite (Rh,Pt,Pd)AsS P a3 2/m 3

02.12.03.09 Jolliffeite (Ni,Co)AsSe P a3 2/m 3

02.12.03.10 Padmaite PdBiSe P 2₁3 2 3

02.12.03.11 Michenerite (Pd,Pt)BiTe P 2₁3 2 3

02.12.03.12 Maslovite PtBiTe P 2₁3 2 3

02.12.03.13 Testibiopalladite PdTe(Sb,Te) P 2₁3 2 3

02.12.03.14 Changchengite! IrBiS P 2₁3 2 3

02.12.03.15 Milotaite! PdSbSe P 2₁/3 2 3

02.12.03.16 Kalungaite! PdAsSe Pa3 2/m 3

Strunz Class:

02.EB.25 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.E - Metal Sulfides, M:S £ 1:2

02.EB -M:S = 1:2, with Fe, Co, Ni, PGE, etc.

02.EB.25 Cobaltite CoAsS P ca2₁ mm2

02.EB.25 Changchengite! IrBiS P 2₁3 2 3

02.EB.25 Hollingworthite (Rh,Pt,Pd)AsS P a3 2/m 3

02.EB.25 Gersdorffite NiAsS P 2₁3 2 3

02.EB.25 Irarsite (Ir,Ru,Rh,Pt)AsS P a3 2/m 3

02.EB.25 Jolliffeite (Ni,Co)AsSe P a3 2/m 3

02.EB.25 Krutovite NiAs2 P a3 2/m 3

02.EB.25 Michenerite (Pd,Pt)BiTe P 2₁3 2 3

02.EB.25 Maslovite PtBiTe P 2₁3 2 3

02.EB.25 Mayingite IrBiTe P a3 2/m 3

02.EB.25 Padmaite PdBiSe P 2₁3 2 3

02.EB.25 Platarsite (Pt,Rh,Ru)AsS P a3 2/m 3

02.EB.25 Ullmannite NiSbS P 2₁3 2 3

02.EB.25 Tolovkite IrSbS P 2₁3 2 3

02.EB.25 Testibiopalladite PdTe(Sb,Te) P 2₁3 2 3

02.EB.25 Willyamite (Co,Ni)SbS P 2₁3 2 3

02.EB.25 Kalungaite! PdAsSe Pa3 2/m 3

02.EB.25 Milotaite! PdSbSe P 2₁/3 2 3

Other Changchengite Information

References:

NAME( AmMin) PHYS. PROP.(Eur. J. Min.,Vol.8,1996) OPTIC PROP.(MinRec, v 29, p 467)

See Also:

Links to other databases for Changchengite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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

Changchengite

IrBiS
Dana No: 02.12.03.14 Strunz No: 02.EB.25
Locality:

Notes: