Yuanjiangite
A valid IMA mineral species
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About Yuanjiangite
Formula:
AuSn
Colour:
Silver-white
Lustre:
Metallic
Hardness:
3½ - 4
Specific Gravity:
11.7 - 11.9
Crystal System:
Hexagonal
Name:
Named after its type locality on the Yuan River (Yuan Jiang), in Yuanling county, Hunan Province, China.
Hexagonal prisms and anhedral grains.
Unique Identifiers
Mindat ID:
7381
Long-form identifier:
mindat:1:1:7381:9
IMA Classification of Yuanjiangite
Approved
Approval year:
1993
First published:
1994
Classification of Yuanjiangite
1.AC.15
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
C : Indium-tin family
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
C : Indium-tin family
Dana 7th ed.:
1.1.4.1
1.1.2.3
1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group
1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group
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 |
|---|---|---|
| Yjg | 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 Yuanjiangite
Metallic
Transparency:
Opaque
Colour:
Silver-white
Comment:
Readily oxidizes to gray or black in air.
Streak:
Black
Hardness:
3½ - 4 on Mohs scale
Hardness:
VHN25=172 - 274 kg/mm2 - Vickers
Tenacity:
Malleable
Cleavage:
None Observed
Density:
11.7 - 11.9 g/cm3 (Measured) 11.78 g/cm3 (Calculated)
Optical Data of Yuanjiangite
Anisotropism:
distinct
Bireflectance:
faint
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 400nm | 55.0% | 55.0% |
| 420nm | 57.2% | 57.5% |
| 440nm | 60.2% | 60.6% |
| 460nm | 63.6% | 63.7% |
| 480nm | 67.1% | 66.7% |
| 500nm | 70.5% | 69.6% |
| 520nm | 73.5% | 72.0% |
| 540nm | 76.1% | 74.3% |
| 560nm | 78.2% | 76.1% |
| 580nm | 79.9% | 77.4% |
| 600nm | 81.1% | 78.4% |
| 620nm | 81.9% | 79.0% |
| 640nm | 82.5% | 79.4% |
| 660nm | 83.1% | 79.6% |
| 680nm | 83.4% | 79.8% |
| 700nm | 83.6% | 80.0% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 83.6%.
R1 shown in black, R2 shown in red
Colour in reflected light:
silver white with a slight yellowish
Chemistry of Yuanjiangite
Mindat Formula:
AuSn
Element Weights:
| Element | % weight |
|---|---|
| Sn | 37.605 % |
Calculated from ideal end-member formula.
Elements listed:
Crystallography of Yuanjiangite
Crystal System:
Hexagonal
Class (H-M):
6/mmm(6/m2/m2/m) - Dihexagonal Dipyramidal
Space Group:
P63/mmc
Setting:
P63/mmc
Cell Parameters:
a = 4.316(1) Å, c = 5.510(2) Å
Ratio:
a:c = 1 : 1.277
Unit Cell V:
88.89 ų (Calculated from Unit Cell)
Z:
2
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
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Remove metal-metal sticks
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View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
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) |
|---|---|---|---|---|---|---|---|
| 0011561 | Yuanjiangite | Wyckoff R W G (1963) Second edition. Interscience Publishers, New York, New York Crystal Structures 1 85-237 | 1963 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.726 Å | (34) |
| 3.087 Å | (38) |
| 2.218 Å | (100) |
| 2.1 59 Å | (57) |
| 1.546 Å | (310 |
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 Yuanjiangite
General Appearance of Type Material:
Crystalline granular aggregates that form nodular, pseudobotryoidal forms to 2 mm, with individual grains generally <5 µm; also rarely as slightly larger hexagonal prisms in drusy cavities.
Place of Conservation of Type Material:
Geological Museum of China, Beijing, and in the China University of Geosciences, Beijing
Geological Setting of Type Material:
Gold and PGE placer.
Associated Minerals at Type Locality:
Synonyms of Yuanjiangite
Other Language Names for Yuanjiangite
Common Associates
Associations Based on Photo Data:
| 4 photos of Yuanjiangite associated with Native Gold | Au |
| 3 photos of Yuanjiangite associated with Rumoiite | AuSn2 |
| 3 photos of Yuanjiangite associated with Native Lead | Pb |
| 1 photo of Yuanjiangite associated with Anyuiite | AuPb2 |
| 1 photo of Yuanjiangite associated with Novodneprite | AuPb3 |
Related Minerals - Strunz-mindat Grouping
| 1.AC.05 | Native Indium | In |
| 1.AC.10 | Native Tin | Sn |
| 1.AC.15 | 'Eta-bronze' | Cu6Sn5 |
| 1.AC.15 | 'UM1965-07-E:CuSn' | Cu3Sn |
| 1.AC.15 | Sorosite | Cu1+x(Sn,Sb) |
| 1.AC.20 | Rumoiite | AuSn2 |
Other Information
Notes:
Readily soluble in aqua regia, slowly soluble in HCl or HNO3.
Special Storage/
Display Requirements:
Display Requirements:
readily oxidizes in air
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 Yuanjiangite
mindat.org URL:
https://www.mindat.org/min-7381.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Yuanjiangite
Localities for Yuanjiangite
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.
Chile | |
| Chouinard et al. (2005) |
China (TL) | |
| Chen Lichang et al. (1994) |
Japan | |
| NISHIO–HAMANE et al. (2021) |
Russia | |
| Sandimirova et al. (2014) |
| Ханчук А.И. et al. (Приморье) |
Uzbekistan | |
| GEOCHMISTRY |
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