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Changchengite Mineral Data
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General Changchengite Information
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 Chemical Formula: |
IrBiS |
| Composition: |
Molecular Weight = 433.27 gm |
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Bismuth 48.23 % Bi |
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Iridium 44.37 % Ir |
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Sulfur 7.40 % S |
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______ |
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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
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| Cell Dimensions: |
a = 6.144, Z = 4; V = 231.93 Den(Calc)= 12.41 |
| Crystal System: |
Isometric - Tetartoidal H-M Symbol (2 3) Space Group: P 213 |
| X Ray Diffraction: |
By Intensity(I/Io): 1.86(1), 2.75(0.7), 2.51(0.6), |
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Physical Properties of Changchengite
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| 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 |
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Optical Properties of Changchengite
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| RL Color: |
Bright white with a yellowish tint. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Changchengite in Air
| λ |
R |
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∑ R(λ) |
| 470 nm |
46.20 |
 |
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| 550 nm |
47.20 |
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| 590 nm |
47.60 |
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| 650 nm |
47.40 |
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Calculated Relative Intensity Colors of Changchengite in Air
Relative
Intensity |
0% |
20% |
40% |
60% |
80% |
100% |
120% |
140% |
160% |
180% |
190% |
| R |
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Calculated Properties of Changchengite
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| Electron Density: |
Bulk Density (Electron Density)=10.1 gm/cc
note: Specific Gravity of Changchengite =12.4 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0005555565
Boson Index = 0.9994444435 |
| Photoelectric: |
PEChangchengite =1,632.42 barns/electron
U=PEChangchengite x rElectron Density=16458.55 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Changchengite is Not Radioactive |
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Changchengite Classification
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| Dana Class: |
02.12.03.14 (02)Sulfides - Including Selenides and Tellurides |
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(02.12)where Am Bn Xp, with (m+n):p=1:2 |
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(02.12.03)Cobaltite Group (Cubic or pseudocubic crystals) |
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02.12.03.01 Cobaltite CoAsS P ca21 mm2 |
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02.12.03.02 Gersdorffite NiAsS P 213 2 3 |
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02.12.03.03 Ullmannite NiSbS P 213 2 3 |
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02.12.03.04 Willyamite (Co,Ni)SbS P 213 2 3 |
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02.12.03.05 Tolovkite IrSbS P 213 2 3 |
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02.12.03.06 Platarsite (Pt,Rh,Ru)AsS P a3 2/m 3 |
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02.12.03.07 Irarsite (Ir,Ru,Rh,Pt)AsS P a3 2/m 3 |
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02.12.03.08 Hollingworthite (Rh,Pt,Pd)AsS P a3 2/m 3 |
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02.12.03.09 Jolliffeite (Ni,Co)AsSe P a3 2/m 3 |
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02.12.03.10 Padmaite PdBiSe P 213 2 3 |
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02.12.03.11 Michenerite (Pd,Pt)BiTe P 213 2 3 |
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02.12.03.12 Maslovite PtBiTe P 213 2 3 |
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02.12.03.13 Testibiopalladite PdTe(Sb,Te) P 213 2 3 |
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02.12.03.14 Changchengite! IrBiS P 213 2 3 |
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02.12.03.15 Milotaite! PdSbSe P 21/3 2 3 |
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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 |
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02.E - Metal Sulfides, M:S � 1:2 |
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02.EB -M:S = 1:2, with Fe, Co, Ni, PGE, etc. |
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02.EB.25 Cobaltite CoAsS P ca21 mm2 |
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02.EB.25 Changchengite! IrBiS P 213 2 3 |
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02.EB.25 Hollingworthite (Rh,Pt,Pd)AsS P a3 2/m 3 |
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02.EB.25 Gersdorffite NiAsS P 213 2 3 |
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02.EB.25 Irarsite (Ir,Ru,Rh,Pt)AsS P a3 2/m 3 |
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02.EB.25 Jolliffeite (Ni,Co)AsSe P a3 2/m 3 |
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02.EB.25 Krutovite NiAs2 P a3 2/m 3 |
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02.EB.25 Michenerite (Pd,Pt)BiTe P 213 2 3 |
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02.EB.25 Maslovite PtBiTe P 213 2 3 |
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02.EB.25 Mayingite IrBiTe P a3 2/m 3 |
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02.EB.25 Padmaite PdBiSe P 213 2 3 |
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02.EB.25 Platarsite (Pt,Rh,Ru)AsS P a3 2/m 3 |
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02.EB.25 Ullmannite NiSbS P 213 2 3 |
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02.EB.25 Tolovkite IrSbS P 213 2 3 |
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02.EB.25 Testibiopalladite PdTe(Sb,Te) P 213 2 3 |
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02.EB.25 Willyamite (Co,Ni)SbS P 213 2 3 |
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02.EB.25 Kalungaite! PdAsSe Pa3 2/m 3 |
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02.EB.25 Milotaite! PdSbSe P 21/3 2 3 |
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Other Changchengite Information
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| 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 :
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Changchengite
IrBiS
Dana No: 02.12.03.14 Strunz No: 02.EB.25
Locality:
Notes:
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