Changchengite Mineral Data

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

Diaphaniety:

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:

r_electron=10.1 gm/cc
note: r_{Changchengite}=12.4 gm/cc.

Fermion Index

Fermion Index = 0.00055
Boson Index = 0.99945

Photoelectric:

PE_{Changchengite}=1,632.42 barns/electron
U=PE_{Changchengite} x r_electron=16458.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Changchengite is Not Radioactive

Changchengite Classification

Dana Class:

2.12.3.14 (2)Sulfides - Including Selenides and Tellurides

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

(2.12.3)Cobaltite Group (Cubic or pseudocubic crystals)

2.12.3.1 Cobaltite CoAsS P ca2₁ mm2

2.12.3.2 Gersdorffite NiAsS P 2₁3 2 3

2.12.3.3 Ullmannite NiSbS P 2₁3 2 3

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

2.12.3.5 Tolovkite IrSbS P 2₁3 2 3

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

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

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

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

2.12.3.10 Padmaite PdBiSe P 2₁3 2 3

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

2.12.3.12 Maslovite PtBiTe P 2₁3 2 3

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

2.12.3.14 Changchengite ! IrBiS P 2₁3 2 3

2.12.3.15 Milotaite! PdSbSe P 2₁/3 2 3

2.12.3.16 IMA2004-047! PdAsSe Pa3 4/m 2/m 2/m

Strunz Class:

II/D.17-153 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.17 - Pyrite group and related compounds, Fukuchilite - Micherenite

II/D.17-10 Fukuchilite Cu3FeS8 P a3 2/m 3

II/D.17-20 Villamaninite (Cu,Ni,Co,Fe)S2 P a3 2/m 3

II/D.17-30 Pyrite FeS2 P a3 2/m 3

II/D.17-40 Cattierite CoS2 P a3 2/m 3

II/D.17-50 Vaesite NiS2 P a3 2/m 3

II/D.17-60 Hauerite MnS2 P a3 2/m 3

II/D.17-65 Dzharkenite FeSe2 P a3 2/m 3

II/D.17-70 Krutaite CuSe2 P a3 2/m 3

II/D.17-80 Trogtalite CoSe2 P a3 2/m 3

II/D.17-90 Penroseite (Ni,Co,Cu)Se2 P a3 2/m 3

II/D.17-100 Laurite RuS2 P a3 2/m 3

II/D.17-110 Erlichmanite OsS2 P a3 2/m 3

II/D.17-120 Sperrylite PtAs2 P a3 2/m 3

II/D.17-130 Aurostibite AuSb2 P a3 2/m 3

II/D.17-140 Geversite Pt(Sb,Bi)2 P a3 2/m 3

II/D.17-150 Insizwaite Pt(Bi,Sb)2 P a3 2/m 3

II/D.17-153 Changchengite IrBiS P 2₁3 2 3

II/D.17-155 Mayingite IrBiTe P a3 2/m 3

II/D.17-160 Maslovite PtBiTe P 2₁3 2 3

II/D.17-170 Testibiopalladite PdTe(Sb,Te) P 2₁3 2 3

II/D.17-175 Padmaite PdBiSe P 2₁3 2 3

II/D.17-180 Michenerite (Pd,Pt)BiTe P 2₁3 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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Changchengite

IrBiS
Dana No: 2.12.3.14 Strunz No: II/D.17-153
Locality:

Notes: