Maldonite
A valid IMA mineral species - grandfathered
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About Maldonite
Formula:
Au2Bi
Colour:
silver white with pink tint
Lustre:
Metallic
Hardness:
1½ - 2
Specific Gravity:
15.46
Crystal System:
Isometric
Member of:
Name:
Named for the type locality, Maldon (Australia).
Thermodynamically unstable below ~116°C, but is found in a metastable state in nature.
Maldonite is the only stable binary alloy phase in the system Au-Bi.
Maldonite is the only stable binary alloy phase in the system Au-Bi.
Unique Identifiers
Mindat ID:
2553
Long-form identifier:
mindat:1:1:2553:5
Similar Names
IMA Classification of Maldonite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1870
Classification of Maldonite
2.AA.40
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
A : Alloys of metalloids with Cu, Ag, Au
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
A : Alloys of metalloids with Cu, Ag, Au
Dana 7th ed.:
1.1.5.1
1.1.3.1
1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group
1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group
1.50
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 IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Mdo | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Mld | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Maldonite
Metallic
Transparency:
Opaque
Colour:
Silver white with pink tint
Comment:
Tarnishes to black
Hardness:
1½ - 2 on Mohs scale
Hardness:
VHN100=147 - 264 kg/mm2 - Vickers
Hardness Data:
Measured
Tenacity:
Malleable
Cleavage:
Distinct/Good
001 & 110
001 & 110
Fracture:
Hackly, Conchoidal
Density:
15.46 g/cm3 (Measured) 15.70 g/cm3 (Calculated)
Optical Data of Maldonite
Reflectivity:
| Wavelength | R1 (%) |
|---|---|
| 400nm | 48.3% |
| 420nm | 49.0% |
| 440nm | 50.2% |
| 460nm | 51.5% |
| 480nm | 53.2% |
| 500nm | 54.9% |
| 520nm | 56.6% |
| 540nm | 58.0% |
| 560nm | 59.0% |
| 580nm | 59.6% |
| 600nm | 59.9% |
| 620nm | 60.0% |
| 640nm | 60.0% |
| 660nm | 60.0% |
| 680nm | 60.0% |
| 700nm | 60.1% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 60.1%.
Colour in reflected light:
White, blue tint
Chemistry of Maldonite
Mindat Formula:
Au2Bi
Element Weights:
| Element | % weight |
|---|---|
| Bi | 34.662 % |
Calculated from ideal end-member formula.
Elements listed:
Crystallography of Maldonite
Crystal System:
Isometric
Class (H-M):
m3m(4/m32/m) - Hexoctahedral
Space Group:
Fd3m
Cell Parameters:
a = 7.97 Å
Unit Cell V:
506.26 ų (Calculated from Unit Cell)
Morphology:
octahedral crystals or massive
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0010552 | Maldonite | Jurriaanse T (1935) The crystal structure of Au2Bi Zeitschrift fur Kristallographie 90 322-329 | ![]() | 1935 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.41 Å | (100) |
| 2.30 Å | (50) |
| 1.53 Å | (60) |
| 1.412 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 Maldonite
Geological Setting of Type Material:
Gold reef associated with Devonian granites
Other Language Names for Maldonite
Relationship of Maldonite to other Species
Member of:
Other Members of Copper Group:
| Native Copper | Cu | Iso. m3m(4/m32/m) : Fm3m |
| Native Gold | Au | Iso. m3m(4/m32/m) : Fm3m |
| Native Silver | Ag | Iso. m3m(4/m32/m) : Fm3m |
Common Associates
Associations Based on Photo Data:
| 3 photos of Maldonite associated with Native Bismuth | Bi |
| 3 photos of Maldonite associated with Native Gold | Au |
| 2 photos of Maldonite associated with Bismuthinite | Bi2S3 |
| 1 photo of Maldonite associated with Bismutite | (BiO)2CO3 |
| 1 photo of Maldonite associated with Bismite | Bi2O3 |
| 1 photo of Maldonite associated with 'Electrum' | (Au,Ag) |
| 1 photo of Maldonite associated with Pyrite | FeS2 |
Related Minerals - Strunz-mindat Grouping
| 2.AA. | Trigodomeykite | Cu3-xAs |
| 2.AA.10b | Domeykite | Cu3As |
| 2.AA.10a | Algodonite | (Cu1-xAsx) |
| 2.AA.10d | Koutekite | Cu5As2 |
| 2.AA.15 | Novákite | (Cu,Ag)21As10 |
| 2.AA.20 | Cuprostibite | Cu2(Sb,Tl) |
| 2.AA.25 | Kutinaite | Ag6Cu14As7 |
| 2.AA.30 | Allargentum | (Ag1-xSbx) |
| 2.AA.35 | Dyscrasite | Ag3Sb |
| 2.AA.45 | Stistaite | SnSb |
| 2.AA.50 | Zaccariniite | RhNiAs |
| 2.AA.55 | Dienerite | Ni3As |
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 Maldonite
mindat.org URL:
https://www.mindat.org/min-2553.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Maldonite
Reference List:
Jurriaanse, T. (1935) The Crystal Structure of Au2Bi. Zeitschrift für Kristallographie, 90 (1-6). 322-329 doi:10.1524/zkri.1935.90.1.322
Berry, L. G., Thompson, R. M. (1962) X-Ray Powder Data for Ore Minerals: the Peacock Atlas. GSA Memoir 85. Geological Society of America doi:10.1130/mem85p.15
Boyer, François, Picot, Paul (1963) Sur la présence de maldonite (Au2Bi) à Salsigne (Aude) Bulletin de Minéralogie, 86 (4) 429 doi:10.3406/bulmi.1963.5680
Localities for Maldonite
Showing 139 localities.
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.
Australia | |
| Sheppard et al. (1995) |
| Lawrence et al. (1998) +1 other reference |
| Paar et al. (2006) |
| Graham-Ruzicka (2014) |
| part of list University of Queensland |
| Cockerton et al. (2012) |
| Zaw et al. (1997) +1 other reference |
| Cristiana Ciobanu & Bill Birch 2008 +1 other reference |
| Mineralogical Society of America - ... | |
| Palache et al. (1944) +1 other reference |
| Ciobanu et al. (2010) | |
| Ciobanu et al. (2010) | |
| Kalleske (2010) |
| Dalstra et al. (2023) |
| Meinert +1 other reference |
Bolivia | |
| Ahlfeld et al. (1964) |
Brazil | |
| Tosi et al. (2026) |
| Jost et al. (2001) |
| Oberthür et al. (2008) |
Bulgaria | |
| Kerestedjian (1997) |
Canada | |
| Montgomery (n.d.) |
| Econ Geol (1992) +2 other references |
| Dawson | |
| personal correspondence with Giles ... |
| Burgess et al. (2014) |
| Wehrle et al. (2023) |
Chile | |
| Maskaev et al. (2007) |
China | |
| Huan Hu et al. (2001) +1 other reference |
| Zhao et al. (1999) |
| Shuzhang Tian et al. (1990) |
| Bin Shu et al. (2006) +4 other references |
| [[1]]Li et al. (2022) |
| Meng et al. (2022) |
| Liu et al. (2020) |
| Shuzhang Tian (1989) |
| Zhang et al. (2021) +1 other reference |
| Dequan Zhang et al. (1991) |
| Feng et al. (2023) |
| Yanming Xu et al. (2013) |
| Ma et al. (2024) +1 other reference |
| Zhou et al. (2016) |
Czech Republic | |
| Zachariáš et al. (1997) |
| Lips (2006) |
| Zachariáš et al. (2014) |
| Šrein (2008) |
| Vavřín (1994) +1 other reference |
| M. Koubov (2001) |
| Ďurišová (1988) |
Finland | |
| Novoselov et al. (2015) |
| Ermolina O et al. (2014) |
| Agnico Eagle Mines Limited |
| Molnár +3 other references |
| Kojonen |
| Hector et al. (2023) |
| Geological Survey of Finland 2008. ... |
| Geological Survey of Finland 2008. ... +1 other reference |
| Hector et al. (2023) |
| Kuikka (2014) |
| www.gsf.fi (2001) +1 other reference |
| Satu Vuori et al. (2005) | |
| Kojonen +1 other reference |
| Kärkkäinen et al. (2012) |
| Eilu (2003) |
France | |
| R. Pierrot |
| Anthony et al. (1990) | |
| Anthony et al. (1990) |
Germany | |
| Dill (2008) |
Greece | |
| Voudouris (2005) |
| Extra Lapis English No. 5 Gold | |
| Korosidis et al. (2022, March) |
Greenland | |
| Grammatikopoulos et al. (2004) |
India | |
| Panthera Resources Plc |
| Anand et al. (2022) | |
Iran | |
| Nezafatis (2006) |
Italy | |
| Fernando Caboni et al. (2024) |
| Luetcke (n.d.) +1 other reference | |
| Deidda et al. (2022) |
Japan | |
| Am. Min. 75:434-435 (1990) |
Mali | |
| Masurel (2016) +1 other reference |
| Randgold Resources |
Mauritania | |
| Sakellaris et al. (2008) |
| Kolb et al. (2006) +2 other references | |
Morocco | |
| Y. Moëlo : "Compte-rendu de la ... |
Namibia | |
| Nörtemann et al. (2000) +1 other reference |
Pacific Ocean | |
| Eos Trans. AGU (48) +1 other reference |
Poland | |
| Mikulski (2005, January) |
| Mikulski (2005) | |
| Siuda (2001) | |
| Mikulski (2013) |
Portugal | |
| São Pedro et al. (2026) |
| Leal et al. (2022) |
| Fuertes-Fuente et al. (2011) +1 other reference |
| Leal et al. (2019) +1 other reference |
Romania | |
| Extra Lapis English No. 5 Gold |
| Cook et al. (2002) |
Russia | |
| Chernyshov et al. (2009, November) |
| Vikentyev (2015) |
| Nagornaya et al. (2020) |
| extraLapis "Gold" issue |
| Volkov et al. (2013) |
| Savva et al. (2022) |
| Litvinenko Ivan Stepanovych (2020) | |
| Savva et al. (2022) |
| Goryachev (2001) | |
| Kalinin et al. (2024) |
| Grebennikova et al. (2023) |
| Grebennikova et al. (2023) | |
| Kuleshevich et al. (2008) |
| Ivashchenko et al. (2018, June) +1 other reference |
| Savva et al. (2022) |
| Gamyanin +6 other references |
| Bortnikov et al. (2007) |
| Redin et al. (2015) |
| Redin et al. (2015) | |
| Gvozdev et al. (2020) | |
| Spiridonov et al. (2010) +1 other reference |
Slovakia | |
| Ferenc et al. (2024) |
South Africa | |
| Otto et al. (2008) |
| Verryn et al. (1991) |
Spain | |
| Andres Navarro Flores collection |
| Calvo Rebollar (2003) |
| Cepedal et al. (2006) |
| Minero (2014) |
Sweden | |
| Jonas Börje Lundin (2015) |
Ukraine | |
| O.K.Babynin et al. (2006) |
| Bobrov et al. (2006, August) +1 other reference |
USA | |
| - (2008) |
| Rombach et al. (2002, October) +1 other reference |
| Illig (2015) | |
| Murdoch (1966) +3 other references |
| ... |
| Ream (1995) |
| Wilson |
Uzbekistan | |
| Koneev et al. (2005) |
| Eshimov et al. (1987) +2 other references |
| Eleonora A. Dunin-Barkovskaya et al. (2005) |
| GEOCHMISTRY | |
Zimbabwe | |
| Oberthür et al. (2008) |
| Blenkinsop et al. (1996) +1 other reference |
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The
Maldon, Mount Alexander Shire, Victoria, Australia