Hunchunite
A valid IMA mineral species
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About Hunchunite
Formula:
Au2Pb
Colour:
Silver grey
Lustre:
Metallic
Hardness:
3½
Specific Gravity:
15.99 (Calculated)
Crystal System:
Isometric
Name:
For its occurrence along the Hunchun River, China.
This page provides mineralogical data about Hunchunite.
Unique Identifiers
Mindat ID:
1949
Long-form identifier:
mindat:1:1:1949:7
IMA Classification of Hunchunite
Approved
Approval year:
1991
First published:
1992
Classification of Hunchunite
1.AA.25
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
A : Copper-cupalite family
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
A : Copper-cupalite family
Dana 7th ed.:
1.3.3.2
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 |
|---|---|---|
| Hcn | 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 Hunchunite
Metallic
Transparency:
Opaque
Colour:
Silver grey
Comment:
Readily oxidizes to a dull gray.
Hardness:
3½ on Mohs scale
Hardness:
VHN5=128 - 149 kg/mm2 - Vickers
Density:
15.99 g/cm3 (Calculated)
Optical Data of Hunchunite
Reflectivity:
| Wavelength | R1 (%) |
|---|---|
| 405nm | 40.9% |
| 436nm | 48.8% |
| 480nm | 58.4% |
| 526nm | 57.9% |
| 546nm | 59.5% |
| 589nm | 60.0% |
| 644nm | 64.0% |
| 656nm | 60.0% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 64.0%.
Colour in reflected light:
Silver-gray
Chemistry of Hunchunite
Mindat Formula:
Au2Pb
Element Weights:
| Element | % weight |
|---|---|
| Pb | 34.468 % |
Calculated from ideal end-member formula.
Elements listed:
Crystallography of Hunchunite
Crystal System:
Isometric
Class (H-M):
m3m(4/m32/m) - Hexoctahedral
Cell Parameters:
a = 7.93 Å
Unit Cell V:
498.68 ų (Calculated from Unit Cell)
Z:
8
Comment:
Fd3m - by analogy to synthetic Au2Pb
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.391 Å | (100) |
| 2.810 Å | (30) |
| 1.196 Å | (26) |
| 2.301 Å | (24) |
| 1.526 Å | (23) |
| 4.595 Å | (21) |
| 1.402 Å | (19) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 26 : Hadean detrital minerals | |
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 40 : Regional metamorphism (greenschist, amphibolite, granulite facies) |
Type Occurrence of Hunchunite
General Appearance of Type Material:
Anhedral granular aggregates, 170-500 x 3-30 µm.
Place of Conservation of Type Material:
National Geological Museum, Beijing, China.
Geological Setting of Type Material:
Quaternary alluvial placers.
Associated Minerals at Type Locality:
Synonyms of Hunchunite
Other Language Names for Hunchunite
Related Minerals - Strunz-mindat Grouping
| 1.AA. | Jonlarsenite | Al4Cu9 |
| 1.AA. | Pratesiite | AgCuTe2 |
| 1.AA.05 | Native Lead | Pb |
| 1.AA.05a | Auricupride Subgroup | |
| 1.AA.05 | Native Nickel | Ni |
| 1.AA.05 | Native Silver | Ag |
| 1.AA.05 | 'UM2004-08-E:AuCuPd' | Cu2PdAu |
| 1.AA.05 | 'UM1991-06-E:AuCu' | Au3Cu |
| 1.AA.05 | Native Aluminium | Al |
| 1.AA.05 | Steinhardtite | Al0.38Ni0.32Fe0.30 |
| 1.AA.05 | Native Gold | Au |
| 1.AA.05 | Native Copper | Cu |
| 1.AA.05 | Copper Group | |
| 1.AA.10a | Cuproauride | Cu3Au |
| 1.AA.10b | Tetra-auricupride | AuCu |
| 1.AA.10a | Auricupride | Cu3Au |
| 1.AA.10 | Nickel Group | |
| 1.AA.15 | Anyuiite | AuPb2 |
| 1.AA.15 | Novodneprite | AuPb3 |
| 1.AA.15 | 'UM1985-02-E:AlZn' | (Zn,Cu)Al2 |
| 1.AA.15 | Khatyrkite | (Cu,Zn)Al2 |
| 1.AA.20 | Cupalite | (Cu,Zn)Al |
| 1.AA.30 | Stolperite | AlCu |
| 1.AA.35 | Hollisterite | Al3Fe |
| 1.AA.40 | Icosahedrite | Al63Cu24Fe13 |
| 1.AA.45 | Kryachkoite | (Al,Cu)6(Fe,Cu) |
| 1.AA.50 | Proxidecagonite | Al34Ni9Fe2 |
Other Information
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 Hunchunite
mindat.org URL:
https://www.mindat.org/min-1949.html
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References for Hunchunite
Localities for Hunchunite
Showing 6 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.
China | |
| Guanxiang Song (1991) |
| Wu Shangquan et al. (1992) |
Finland | |
| Molnár +3 other references |
Russia | |
| Sandimirova et al. (2014) |
| Svetlitskaya et al. (2017) |
| Witzke (2023) |
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Nizhnii Tagil, Sverdlovsk Oblast, Russia