Mineralogy Database

Changchengite Mineral Data

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General Changchengite Information

Help on Chemical  Formula: Chemical Formula: IrBiS
Help on Composition: Composition: Molecular Weight = 433.27 gm
   Bismuth  48.23 %  Bi
   Iridium  44.37 %  Ir
   Sulfur    7.40 %  S
           ______ 
           100.00 % 
Help on Empirical Formula: Empirical Formula: IrBiS
Help on Environment: Environment: Pt placer deposits derived from the host chromite ore bodies in dunite.
Help on IMA Status: IMA Status: Approved IMA 1997 (Dana # Added)
Help on Locality: Locality: Along a branch of the Luanhe River in Hebei Province, about 200 km ENE of Beijing, China. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after chancheng, the name of the "Great Wall" of China.
Help on Synonym: Synonym: IMA1995-047
 

Changchengite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 6.144, Z = 4; V = 231.93 Den(Calc)= 12.41
Help on Crystal System: Crystal System: Isometric - Tetartoidal H-M Symbol (2 3) Space Group: P 213
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.86(1), 2.75(0.7), 2.51(0.6),
 

Physical Properties of Changchengite

Help on Cleavage: Cleavage: None
Help on Color: Color: Gray, Black.
Help on Density: Density: 11.96 - 12.27, Average = 12.11
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: black
 

Optical Properties of Changchengite

Help on RL Color: RL Color: Bright white with a yellowish tint.
Help on Reflectivity 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=10.1 gm/cc
note: Specific Gravity of Changchengite =12.4 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0005555565
Boson Index = 0.9994444435
Help on Photoelectric: Photoelectric: PEChangchengite =1,632.42 barns/electron
U=PEChangchengite x rElectron Density=16458.55 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Changchengite is Not Radioactive
 

Changchengite Classification

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( AmMin) PHYS. PROP.(Eur. J. Min.,Vol.8,1996) OPTIC PROP.(MinRec, v 29, p 467)
Help on See Also: 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:

 

 
   
 


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