Changchengite
A valid IMA mineral species
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Formula:
IrBiS
Colour:
Steel gray
Lustre:
Metallic
Hardness:
3½
Specific Gravity:
11.96 (Calculated)
Crystal System:
Isometric
Member of:
Name:
Named after Changcheng, the romanized name of the "Great Wall" of China.
This page provides mineralogical data about Changchengite.
Unique Identifiers
Mindat ID:
6860
Long-form identifier:
mindat:1:1:6860:0
GUID
(UUID V4):
(UUID V4):
80450b7d-c42a-444f-b510-31d51f3e2636
Classification of Changchengite
Approved
First published:
1997
Type description reference:
2.EB.25
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
B : M:S = 1:2, with Fe, Co, Ni, PGE, etc.
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
B : M:S = 1:2, with Fe, Co, Ni, PGE, etc.
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Ccg | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Changchengite
Metallic
Transparency:
Opaque
Colour:
Steel gray
Streak:
Black
Hardness:
3½ on Mohs scale
Hardness:
VHN20=140 - 185 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Density:
11.96 g/cm3 (Calculated)
Optical Data of Changchengite
Type:
Isotropic
Reflectivity:
Wavelength | R |
---|---|
400nm | 43.3% |
440nm | 45.5% |
480nm | 46.4% |
520nm | 46.9% |
560nm | 47.3% |
600nm | 47.7% |
640nm | 47.6% |
680nm | 47.3% |
700nm | 47.3% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 47.7%.
Colour in reflected light:
Bright white with a yellowish tint
Chemical Properties of Changchengite
Formula:
IrBiS
Elements listed:
Crystallography of Changchengite
Crystal System:
Isometric
Class (H-M):
2 3 - Tetartoidal
Space Group:
P21 3
Cell Parameters:
a = 6.164(3) Å
Unit Cell V:
234.20 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.75 Å | (70) |
2.51 Å | (60) |
1.860 Å | (100) |
1.090 Å | (50) |
1.027 Å | (50) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-? alteration and/or metamorphism | |
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Changchengite
Co-Type Localities:
General Appearance of Type Material:
Aggregates to 0.2 mm, and as veinlets to 0.2 mm width and 1.0 mm length.
Place of Conservation of Type Material:
National Geological Museum of China, Beijing, China.
Geological Setting of Type Material:
Platinum placer deposits
Associated Minerals at Type Locality:
Reference:
Yu, Z. (1997) Changchengite - A new iridium bismuthide sulfide. Acta Geologica Sinica: 71(4): 336-339.
Synonyms of Changchengite
Other Language Names for Changchengite
Relationship of Changchengite to other Species
Member of:
Other Members of this group:
Andrieslombaardite | RhSbS | Iso. 2 3 : P21 3 |
Cobaltite | CoAsS | Orth. mm2 : Pca21 |
Gersdorffite | NiAsS | Iso. m3 (2/m 3) : Pa3 |
Hollingworthite | (Rh,Pt,Pd)AsS | Iso. m3 (2/m 3) : Pa3 |
Irarsite | (Ir,Ru,Rh,Pt)AsS | Iso. m3 (2/m 3) : Pa3 |
Jolliffeite | NiAsSe | Iso. m3 (2/m 3) : Pa3 |
Kalungaite | PdAsSe | Iso. m3 (2/m 3) : Pa3 |
Maslovite | PtBiTe | Iso. 2 3 : P21 3 |
Mayingite | IrBiTe | Iso. m3 (2/m 3) : Pa3 |
Michenerite | PdBiTe | Iso. 2 3 : P21 3 |
Milotaite | PdSbSe | Iso. 2 3 : P21 3 |
Padmaite | PdBiSe | Iso. 4 3 2 |
Platarsite | PtAsS | Iso. m3 (2/m 3) : Pa3 |
Testibiopalladite | PdTe(Sb,Te) | Iso. |
Tolovkite | IrSbS | Iso. |
Ullmannite | NiSbS | Iso. 2 3 : P21 3 |
UM1991-19-Se:AsCo | (Co,Ni)AsSe | Iso. m3 (2/m 3) : Pm3 |
Willyamite | CoSbS |
Related Minerals - Strunz-mindat Grouping
2.EB. | Iridarsenite | (Ir,Ru)As2 |
2.EB. | Selenolaurite | RuSe2 |
2.EB. | Andrieslombaardite | RhSbS |
2.EB. | Kanatzidisite | (SbBiS3)2Te2 |
2.EB.05a | Aurostibite | AuSb2 |
2.EB.05b | Bambollaite | Cu(Se,Te)2 |
2.EB.05a | Cattierite | CoS2 |
2.EB.05a | Erlichmanite | OsS2 |
2.EB.05a | Fukuchilite | Cu3FeS8 |
2.EB.05a | Geversite | PtSb2 |
2.EB.05a | Hauerite | MnS2 |
2.EB.05a | Insizwaite | Pt(Bi,Sb)2 |
2.EB.05a | Krut'aite | CuSe2 |
2.EB.05a | Laurite | RuS2 |
2.EB.05a | Penroseite | (Ni,Co,Cu)Se2 |
2.EB.05a | Pyrite | FeS2 |
2.EB.05a | Sperrylite | PtAs2 |
2.EB.05a | Trogtalite | CoSe2 |
2.EB.05a | Vaesite | NiS2 |
2.EB.05a | Villamanínite | (Cu,Ni,Co,Fe)S2 |
2.EB.05a | Dzharkenite | FeSe2 |
2.EB.05a | Gaotaiite | Ir3Te8 |
2.EB.05a v | Cayeuxite | |
2.EB.10b | Alloclasite | Co1-xFexAsS |
2.EB.10d | Costibite | CoSbS |
2.EB.10a | Ferroselite | FeSe2 |
2.EB.10a | Frohbergite | FeTe2 |
2.EB.10c | Glaucodot | (Co0.50Fe0.50)AsS |
2.EB.10a | Kullerudite | NiSe2 |
2.EB.10a | Marcasite | FeS2 |
2.EB.10a | Mattagamite | CoTe2 |
2.EB.10e | Paracostibite | CoSbS |
2.EB.10e | Pararammelsbergite | NiAs2 |
2.EB.10f | Oenite | CoSbAs |
2.EB.10a | Petříčekite | CuSe2 |
2.EB.15a | Anduoite | (Ru,Os)As2 |
2.EB.15a | Clinosafflorite | CoAs2 |
2.EB.15a | Löllingite | FeAs2 |
2.EB.15a | Nisbite | NiSb2 |
2.EB.15a | Omeiite | (Os,Ru)As2 |
2.EB.15c | Paxite | CuAs2 |
2.EB.15a | Rammelsbergite | NiAs2 |
2.EB.15a | Safflorite | (Co,Ni,Fe)As2 |
2.EB.15b | Seinäjokite | (Fe,Ni)(Sb,As)2 |
2.EB.20 | Arsenopyrite | FeAsS |
2.EB.20 | Gudmundite | FeSbS |
2.EB.20 | Osarsite | (Os,Ru)AsS |
2.EB.20 | Ruarsite | (Ru,Os)AsS |
2.EB.25 va | Antimony-bearing Gersdorffite | Ni(As,Sb)S |
2.EB.25 | Cobaltite | CoAsS |
2.EB.25 | Gersdorffite | NiAsS |
2.EB.25 | Hollingworthite | (Rh,Pt,Pd)AsS |
2.EB.25 | Irarsite | (Ir,Ru,Rh,Pt)AsS |
2.EB.25 | Jolliffeite | NiAsSe |
2.EB.25 | Krutovite | NiAs2 |
2.EB.25 | Maslovite | PtBiTe |
2.EB.25 | Michenerite | PdBiTe |
2.EB.25 | Padmaite | PdBiSe |
2.EB.25 | Platarsite | PtAsS |
2.EB.25 | Testibiopalladite | PdTe(Sb,Te) |
2.EB.25 | Tolovkite | IrSbS |
2.EB.25 | Ullmannite | NiSbS |
2.EB.25 | Willyamite | CoSbS |
2.EB.25 | Mayingite | IrBiTe |
2.EB.25 | Kalungaite | PdAsSe |
2.EB.25 | Milotaite | PdSbSe |
2.EB.25 | Paragersdorffite | Ni(As,S)2 |
2.EB.25 | Orthogersdorffite | NiAsS |
2.EB.30 | Urvantsevite | Pd(Bi,Pb)2 |
2.EB.35 | Rheniite | ReS2 |
Other Information
Magnetism:
Non-Magnetic
Notes:
Insoluble in HNO3, HCl, and H3PO4
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Changchengite
mindat.org URL:
https://www.mindat.org/min-6860.html
Please feel free to link to this page.
Please feel free to link to this page.
External Links:
Mineral Dealers:
References for Changchengite
Reference List:
Localities for Changchengite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
China (TL) | |
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