Chengdeite
A valid IMA mineral species
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About Chengdeite
Formula:
Ir3Fe
Colour:
Steel-black
Lustre:
Metallic
Hardness:
5
Specific Gravity:
19.19 (Calculated)
Crystal System:
Isometric
Name:
After the type locality at Gaotai village, in the Luan River (Luan He) valley, CHENGDE Prefecture, Hebei Province, China.
Found in chromite ores in ultrabasic rocks and associated placer deposits.
Unique Identifiers
Mindat ID:
1208
Long-form identifier:
mindat:1:1:1208:5
Similar Names
| Chenguodaite | A valid IMA mineral species | Ag9Fe3+Te2S4 |
IMA Classification of Chengdeite
Approved
Approval year:
1994
First published:
1995
Type description reference:
Classification of Chengdeite
1.AG.35
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
G : PGE-metal alloys
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
G : PGE-metal alloys
Dana 7th ed.:
1.2.6.2
1.2.5.5
1 : NATIVE ELEMENTS AND ALLOYS
2 : Platinum Group Metals and Alloys
1 : NATIVE ELEMENTS AND ALLOYS
2 : Platinum Group Metals and Alloys
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 for Standard |
|---|---|---|
| Cgd | 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 Chengdeite
Metallic
Transparency:
Opaque
Colour:
Steel-black
Streak:
Black
Hardness:
5 on Mohs scale
Hardness:
VHN50=411 - 467 kg/mm2 - Vickers
Tenacity:
Malleable
Density:
19.19 g/cm3 (Calculated)
Optical Data of Chengdeite
Type:
Isotropic
Bireflectance:
None
Reflectivity:
| Wavelength | R1 (%) |
|---|---|
| 400nm | 61.7% |
| 470nm | 66.2% |
| 540nm | 69.1% |
| 550nm | 69.5% |
| 590nm | 71.1% |
| 650nm | 72.5% |
| 700nm | 72.8% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 72.8%.
Colour in reflected light:
Bright white with a yellowish tint
Pleochroism:
Non-pleochroic
Chemistry of Chengdeite
Mindat Formula:
Ir3Fe
Elements listed:
Crystallography of Chengdeite
Crystal System:
Isometric
Class (H-M):
m3m(4/m32/m) - Hexoctahedral
Cell Parameters:
a = 3.792(5) Å
Unit Cell V:
54.53 ų (Calculated from Unit Cell)
Z:
1
Comment:
Space Group: Pm3m.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0011977 | Chengdeite | Zuxiang Y (1995) Chengdeite - ordered natural iron-iridium alloy Acta Geologica Sinica 69 215-220 | 1995 | Placer deposits off the Luanhe River, China | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.18 Å | (80) |
| 1.89 Å | (60) |
| 1.34 Å | (70) |
| 1.142 Å | (100) |
| 1.094 Å | (80) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 26 : Hadean detrital minerals | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 37 : Layered igneous intrusions and related PGE minerals |
Type Occurrence of Chengdeite
General Appearance of Type Material:
Grains to 0.5 mm associated with inaglyite, to 0.5 mm in graphic intergrowths with iridium, and to 20 pm in association with
(Fe,Ni,Cu)2IrS3
(Fe,Ni,Cu)2IrS3
Place of Conservation of Type Material:
Geological Museum of China, Beijing.
Geological Setting of Type Material:
Placer concentrates
Associated Minerals at Type Locality:
Synonyms of Chengdeite
Other Language Names for Chengdeite
Common Associates
Associations Based on Photo Data:
| 2 photos of Chengdeite associated with Native Osmium | (Os,Ir,Ru) |
| 1 photo of Chengdeite associated with Native Iridium | (Ir,Os,Ru) |
Related Minerals - Strunz-mindat Grouping
| 1.AG. | Sluzhenikinite | Pd15(Sb7-xSnx) |
| 1.AG. | Palladothallite | Pd3Tl |
| 1.AG. | Driekopite | PtBi |
| 1.AG. | Sidorovite | Fe3Pt |
| 1.AG. | Michitoshiite-(Cu) | Rh(Cu1-xGex) |
| 1.AG.05 | Hexaferrum | (Fe,Os,Ru,Ir) |
| 1.AG.05 | Garutiite | (Ni,Fe,Ir) |
| 1.AG.10 | Zvyagintsevite | Pd3Pb |
| 1.AG.10 | Rustenburgite | (Pt,Pd)3Sn |
| 1.AG.10 | Atokite | (Pd,Pt)3Sn |
| 1.AG.15 | Taimyrite | (Pd,Cu,Pt)3Sn |
| 1.AG.15 | Tatyanaite | (Pt,Pd,Cu)9Cu3Sn4 |
| 1.AG.20 | Paolovite | Pd2Sn |
| 1.AG.25 | Stannopalladinite | (Pd,Cu)3Sn |
| 1.AG.25 | Plumbopalladinite | Pd3Pb2 |
| 1.AG.30 | Cabriite | Pd2CuSn |
| 1.AG.35 | Isoferroplatinum | Pt3Fe |
| 1.AG.40 | Tetraferroplatinum | PtFe |
| 1.AG.40 | Tulameenite | Pt2CuFe |
| 1.AG.40 | Ferronickelplatinum | Pt2FeNi |
| 1.AG.45 | Skaergaardite | PdCu |
| 1.AG.45 | Hongshiite | PtCu |
| 1.AG.50 | Yixunite | Pt3In |
| 1.AG.55 | Damiaoite | PtIn2 |
| 1.AG.60 | Niggliite | PtSn |
| 1.AG.65 | Bortnikovite | Pd4Cu3Zn |
| 1.AG.70 | Nielsenite | PdCu3 |
| 1.AG.75 | Norilskite | (Pd,Ag)2xPb (x = 0.08 - 0.11) |
Other Information
Notes:
Strong Magnetism
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 Chengdeite
mindat.org URL:
https://www.mindat.org/min-1208.html
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References for Chengdeite
Reference List:
Localities for Chengdeite
Showing 10 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Canada | |
| Alfredo Petrov |
China (TL) | |
| Zuxiang Yu (1995) |
| Zuxiang Yu (1995) | |
Colombia | |
| Aiglsperger et al. (2017) |
Japan | |
| NISHIO–HAMANE et al. (2022) |
| NISHIO–HAMANE et al. (2022) |
| Dr Daisuke Nishio-Hamane +1 other reference |
Russia | |
| SEM by Excalibur Mineral Co. |
| Badanina et al. (2011) |
| Airiyants et al. (2014) |
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Tolovka River placer, Ust'-Bel'skii ultrabasic Massif, Koryak Okrug, Kamchatka Krai, Russia