Eugenite
A valid IMA mineral species
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About Eugenite
Formula:
Ag11Hg2
Colour:
Black, silver, bronze
Lustre:
Metallic
Hardness:
2½ - 3
Specific Gravity:
10.75
Crystal System:
Isometric
Member of:
Name:
Named in honor of Eugen Friedrich Stumpfl (27 November 1931, Munich, Germany - 12 July 2004, Innsbruck, Austria), professor of mineralogy, Mining Institute, Leoben (Austria), for his studies of noble metal compounds. The mineral stumpflite is also named after him.
This page provides mineralogical data about Eugenite.
Unique Identifiers
Mindat ID:
1422
Long-form identifier:
mindat:1:1:1422:5
GUID
(UUID V4):
(UUID V4):
ff326481-b1cb-4cf0-828c-6a5fe4a3240a
IMA Classification of Eugenite
Approved
First published:
1986
Classification of Eugenite
1.AD.15c
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
D : Mercury-amalgam family
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
D : Mercury-amalgam family
Dana 7th ed.:
1.1.11.5
1.1.8.5
1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group
1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group
1.15
1 : Elements and Alloys (including the arsenides, antimonides and bismuthides of Cu, Ag and Au)
1 : Elements and Alloys (including the arsenides, antimonides and bismuthides of Cu, Ag and Au)
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Eug | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Eugenite
Metallic
Transparency:
Opaque
Colour:
Black, silver, bronze
Hardness:
2½ - 3 on Mohs scale
Hardness:
VHN15=85.8 - 106 kg/mm2 - Vickers
Density:
10.75(3) g/cm3 (Measured) 10.45 g/cm3 (Calculated)
Optical Data of Eugenite
Type:
Isotropic
Reflectivity:
Wavelength | R |
---|---|
546nm | 80.1% |
589nm | 82.7% |
656nm | 85.6% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 85.6%.
Colour in reflected light:
White with a faint yellow tinge
Chemistry of Eugenite
Mindat Formula:
Ag11Hg2
Elements listed:
Crystallography of Eugenite
Crystal System:
Isometric
Class (H-M):
4 3m - Hextetrahedral
Space Group:
I4 3m
Cell Parameters:
a = 10.02(2) Å
Unit Cell V:
1,006.01 Ă
Âł (Calculated from Unit Cell)
Z:
4
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
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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) |
---|---|---|---|---|---|---|---|
0014123 | Eugenite | Owen E A, O'Donnell Roberts E A (1945) The solubility of certain metals in gold Journal of the Institute of Metals 71 213-254 | 1945 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.37 Ă | (100) |
2.10 Ă | (80) |
1.457 Ă | (70) |
1.240 Ă | (70) |
1.193 Ă | (60) |
1.033 Ă | (50) |
0.950 Ă | (80) |
0.925 Ă | (80) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-đ alteration and/or metamorphism | |
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Eugenite
General Appearance of Type Material:
Grains up to 4 mm
Place of Conservation of Type Material:
Institute of Geology and Mineral Deposits, Cracow, Poland.
Associated Minerals at Type Locality:
Reference:
Kucha, H. (1986) Eugenite, Ag11Hg2 - A new mineral from Zechstein copper deposits in Poland. Mineralogia Polonica: 17: 3-10.
Synonyms of Eugenite
Other Language Names for Eugenite
Relationship of Eugenite to other Species
Member of:
Other Members of this group:
Luanheite | Ag3Hg | Hex. |
Paraschachnerite | Ag3Hg2 | Orth. |
Schachnerite | Ag1.1Hg0.9 | Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc |
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
1.AD. | Aurihydrargyrumite | Au6Hg5 |
1.AD.05 | Mercury | Hg |
1.AD.10 | Belendorffite | Cu7Hg6 |
1.AD.10 | Kolymite | Cu7Hg6 |
1.AD.15b | Luanheite | Ag3Hg |
1.AD.15d | Moschellandsbergite | Ag2Hg3 |
1.AD.15a | Paraschachnerite | Ag3Hg2 |
1.AD.15a | Schachnerite | Ag1.1Hg0.9 |
1.AD.20a | Weishanite | (Au,Ag,Hg) |
1.AD.20b | Goldamalgam (of Chen et al.) | (Au,Ag)Hg |
1.AD.20c | Yiyangite | Au3Hg |
1.AD.25 | Potarite | PdHg |
1.AD.30 | Leadamalgam | Pb0.7Hg0.3 |
1.AD.35 | Shosanbetsuite | Ag3Sn |
1.AD.40 | Unnamed (Au2Hg) | Au2Hg |
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 Eugenite
mindat.org URL:
https://www.mindat.org/min-1422.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Eugenite
Reference List:
Localities for Eugenite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - 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.
Australia | |
| Leverett et al. (2005) |
Austria | |
| Steiner et al. (2010) |
Chile | |
| The Stratabound Tuff-hosted Elisa de ... +1 other reference |
China | |
| Puritch et al. (2005) |
| Ran Lu et al. (2012) |
Germany | |
| www.mineralienfreunde-der-pfalz.de (2012) |
Mongolia | |
| Khashgerel et al. (2008) |
Morocco | |
| S. WeiĂ: Lapis 31 (7/8) |
| Barral et al. (2008) |
| Poot +7 other references |
Myanmar | |
| Aung Myo et al. (2019) +1 other reference |
Namibia | |
| RRUFF database. XRD confirmed. |
Norway | |
| Kullerud et al. (2020) |
Poland (TL) | |
| Mineralogia Polonica: 23 (1) +2 other references |
| Mederski et al. (2020) |
| Siuda (2012) |
Mochnacka et al. (2012) | |
PiestrzyĆski et al. (2012) | |
| Kucha H. 2007: Mineralogia kruszcowa i ... |
PiestrzyĆski A. | |
| Krzeminski (2015, August) |
Russia | |
| www.encyclopedia.com (n.d.) |
Sweden | |
| Rincon (2022) |
| Holmgren (2002) |
USA | |
| Graeme (1993) |
| Anthony et al. (1995) |
| Travis Olds collection +1 other reference |
| Quigley +1 other reference |
| Robert C. Smith |
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