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Maldonite

A valid IMA mineral species - grandfathered
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About MaldoniteHide

00077330017271924972475.jpg
Maldon, Australia
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.


Unique IdentifiersHide

Mindat ID:
2553
Long-form identifier:
mindat:1:1:2553:5

Similar NamesHide

MiltoniteA synonym of Bassanite

IMA Classification of MaldoniteHide

Approved, 'Grandfathered' (first described prior to 1959)
First published:
1870

Classification of MaldoniteHide

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
Dana 7th ed.:
1.1.5.1
1.1.3.1

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)

Mineral SymbolsHide

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.

SymbolSourceReference for Standard
MdoIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
MldThe 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 MaldoniteHide

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
Fracture:
Hackly, Conchoidal
Density:
15.46 g/cm3 (Measured)    15.70 g/cm3 (Calculated)

Optical Data of MaldoniteHide

Reflectivity:
WavelengthR1 (%)
400nm48.3%
420nm49.0%
440nm50.2%
460nm51.5%
480nm53.2%
500nm54.9%
520nm56.6%
540nm58.0%
560nm59.0%
580nm59.6%
600nm59.9%
620nm60.0%
640nm60.0%
660nm60.0%
680nm60.0%
700nm60.1%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 60.1%.
Colour in reflected light:
White, blue tint

Chemistry of MaldoniteHide

Mindat Formula:
Au2Bi
Element Weights:
Element% weight
Bi34.662 %

Calculated from ideal end-member formula.

Crystallography of MaldoniteHide

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 StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0010552MaldoniteJurriaanse T (1935) The crystal structure of Au2Bi Zeitschrift fur Kristallographie 90 322-3291935synthetic0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.41 Å(100)
2.30 Å(50)
1.53 Å(60)
1.412 Å(50)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-? alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

Type Occurrence of MaldoniteHide

Other Language Names for MaldoniteHide

Dutch:Maldoniet
Simplified Chinese:黑铋金矿
Spanish:Maldonita

Relationship of Maldonite to other SpeciesHide

Member of:
Other Members of Copper Group:
Native CopperCuIso. m3m(4/m32/m) : Fm3m
Native GoldAuIso. m3m(4/m32/m) : Fm3m
Native SilverAgIso. m3m(4/m32/m) : Fm3m

Common AssociatesHide

Associations Based on Photo Data:
3 photos of Maldonite associated with Native BismuthBi
3 photos of Maldonite associated with Native GoldAu
2 photos of Maldonite associated with BismuthiniteBi2S3
1 photo of Maldonite associated with Bismutite(BiO)2CO3
1 photo of Maldonite associated with BismiteBi2O3
1 photo of Maldonite associated with 'Electrum'(Au,Ag)
1 photo of Maldonite associated with PyriteFeS2

Related Minerals - Strunz-mindat GroupingHide

2.AA.TrigodomeykiteCu3-xAsTrig. 3 : P3
2.AA.10bDomeykiteCu3AsIso. 43m : I43d
2.AA.10aAlgodonite(Cu1-xAsx)Hex. 6/mmm(6/m2/m2/m) : P63/mmc
2.AA.10dKoutekiteCu5As2Hex.
2.AA.15Novákite(Cu,Ag)21As10Mon.
2.AA.20CuprostibiteCu2(Sb,Tl)Tet. 4/mmm(4/m2/m2/m) : P4/nmm
2.AA.25KutinaiteAg6Cu14As7Iso. m3m(4/m32/m)
2.AA.30Allargentum(Ag1-xSbx)Hex.
2.AA.35DyscrasiteAg3SbOrth. mm2 : Pmm2
2.AA.45StistaiteSnSbTrig. 3m(32/m) : R3m
2.AA.50ZaccariniiteRhNiAs Tet. 4/mmm(4/m2/m2/m) : P4/nmm
2.AA.55DieneriteNi3AsIso. 43m : I43d

Other InformationHide

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 MaldoniteHide

References for MaldoniteHide

Reference List:

Localities for MaldoniteHide

Showing 139 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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Locality ListHide

- 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). 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.
Australia
 
  • New South Wales
    • Georgiana County
      • Burraga
Sheppard et al. (1995)
    • Gough Co.
Lawrence et al. (1998) +1 other reference
    • Robinson Co.
      • Cobar
Paar et al. (2006)
  • Queensland
    • Mareeba Shire
      • Chillagoe
Graham-Ruzicka (2014)
    • North Burnett Region
      • Mount Biggenden
part of list University of Queensland
  • Tasmania
    • Kentish municipality
      • Moina - Middlesex District
Cockerton et al. (2012)
    • West Coast municipality
      • Rosebery district
        • Rosebery
Zaw et al. (1997) +1 other reference
  • Victoria
    • Mount Alexander Shire
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)
  • Western Australia
    • Boddington Shire
      • Bannister
Kalleske (2010)
    • Paterson Orogen
Dalstra et al. (2023)
    • Yilgarn Shire
      • Marvel Loch
Meinert +1 other reference
Bolivia
 
  • Potosí
    • Sud Lípez Province
      • Esmoraca district
Ahlfeld et al. (1964)
Brazil
 
  • Espírito Santo
    • Castelo
Tosi et al. (2026)
  • Goiás
    • Guarinos
Jost et al. (2001)
  • Minas Gerais
    • Mariana
      • Passagem de Mariana
Oberthür et al. (2008)
Bulgaria
 
  • Haskovo Province
    • Ivaylovgrad Municipality
      • Ivaylovgrad
Kerestedjian (1997)
Canada
 
  • British Columbia
    • Lillooet Mining Division
Montgomery (n.d.)
    • Osoyoos Mining Division
      • Hedley
Econ Geol (1992) +2 other references
Dawson
    • Similkameen Mining Division
      • Siwash Lake
personal correspondence with Giles ...
  • Northwest Territories
    • Mazenod Lake District
Burgess et al. (2014)
  • Ontario
    • Algoma District
      • McMurray Township
Wehrle et al. (2023)
Chile
 
  • Aisén
    • Coihaique Province
      • Cerro Estatuas Ñirehuao District
Maskaev et al. (2007)
China
 
  • Anhui
    • Tongling
      • Shizishan ore field
Huan Hu et al. (2001) +1 other reference
      • Tongguanshan ore field
Zhao et al. (1999)
  • Guangdong
    • Zhaoqing
      • Fengkai County
Shuzhang Tian et al. (1990)
  • Hainan
    • Ledong Co.
Bin Shu et al. (2006) +4 other references
  • Hebei
    • Chengde
      • Pingquan County
[[1]]Li et al. (2022)
  • Heilongjiang
    • Shuangyashan
      • Baoqing County
Meng et al. (2022)
  • Henan
    • Sanmenxia
      • Lingbao City
Liu et al. (2020)
  • Hunan
    • Yiyang
      • Heshan District
Shuzhang Tian (1989)
  • Inner Mongolia
    • Bayannur City (Bayannao'er Prefecture)
      • Urad Middle Banner (Wulate Zhongqi)
Zhang et al. (2021) +1 other reference
    • Chifeng City (Ulanhad League; Chifeng Prefecture)
      • Bairin Left Banner (Balin Zuoqi)
Dequan Zhang et al. (1991)
  • Liaoning
    • Dandong
      • Zhen'an District
        • Wulong orefield
Feng et al. (2023)
  • Shaanxi
    • Weinan
      • Tongguan County
        • Tongyu gold field
Yanming Xu et al. (2013)
  • Sichuan
    • Garzê Autonomous Prefecture (Ganzi Autonomous Prefecture)
      • Danba Co.
        • Xintaizi Au ore field
Ma et al. (2024) +1 other reference
  • Yunnan
    • Dali
      • Heqing County
Zhou et al. (2016)
Czech Republic
 
  • Central Bohemian Region
    • Příbram District
      • Hvožďany
Zachariáš et al. (1997)
      • Psí hory gold mining district
        • Borotice
          • Čelina
Lips (2006)
        • Chotilsko
          • Mokrsko
Zachariáš et al. (2014)
  • Plzeň Region
    • Klatovy District
Šrein (2008)
      • Kašperské Hory
Vavřín (1994) +1 other reference
  • South Bohemian Region
    • Písek District
      • Milevsko
M. Koubov (2001)
  • Vysočina Region
    • Pelhřimov District
      • Humpolec
Ďurišová (1988)
Finland
 
  • Central Finland
    • Pihtipudas
      • Kanalanmäki area
        • Säkkärämäki
Novoselov et al. (2015)
  • Kainuu
    • Kuhmo
Ermolina O et al. (2014)
  • Lapland
    • Kittilä
Agnico Eagle Mines Limited
    • Ylitornio
Molnár +3 other references
  • North Ostrobothnia
    • Haapavesi
Kojonen
    • Kalajoki
Hector et al. (2023)
    • Kuusamo
Geological Survey of Finland 2008. ...
    • Raahe
Geological Survey of Finland 2008. ... +1 other reference
    • Ylivieska
Hector et al. (2023)
  • Pirkanmaa
    • Lempäälä
Kuikka (2014)
  • Satakunta
    • Huittinen
www.gsf.fi (2001) +1 other reference
Satu Vuori et al. (2005)
  • South Savo
    • Rantasalmi
Kojonen +1 other reference
  • Southwest Finland
    • Naantali
Kärkkäinen et al. (2012)
    • Somero
Eilu (2003)
France
 
  • Auvergne-Rhône-Alpes
    • Cantal
      • Saint-Flour
        • Bonnac
          • Moulin de la Borie (Bonnac South)
R. Pierrot
Anthony et al. (1990)
  • Occitanie
    • Aude
      • Carcassonne
        • Salsigne
Anthony et al. (1990)
Germany
 
  • Bavaria
    • Lower Bavaria
Dill (2008)
Greece
 
  • Attica
    • East Attica
      • Lavreotiki
        • Agios Konstantinos (Kamariza)
Voudouris (2005)
Extra Lapis English No. 5 Gold
  • South Aegean
    • Milos
      • Serifos Island
Korosidis et al. (2022, March)
Greenland
 
  • Kujalleq
    • Napasorsuaq
Grammatikopoulos et al. (2004)
India
 
  • Rajasthan
    • Udaipur Division
      • Banswara District
Panthera Resources Plc
Anand et al. (2022)
Iran
 
  • Markazi Province
    • Shazand County
Nezafatis (2006)
Italy
 
  • Sardinia
    • South Sardinia Province
Fernando Caboni et al. (2024)
Luetcke (n.d.) +1 other reference
      • Gonnosfanadiga
Deidda et al. (2022)
Japan
 
  • Kagoshima Prefecture
Am. Min. 75:434-435 (1990)
Mali
 
  • Kayes Region
    • Kayes Cercle
      • Sadiola Commune
Masurel (2016) +1 other reference
  • Sikasso Region
    • Bougouni Cercle
Randgold Resources
Mauritania
 
  • Inchiri Region
    • Akjoujt (Akjout; Fort Repoux)
Sakellaris et al. (2008)
Kolb et al. (2006) +2 other references
Morocco
 
  • Marrakesh-Safi Region
    • Al Haouz Province
      • Asni Cercle
        • Tichka Massif
Y. Moëlo : "Compte-rendu de la ...
Namibia
 
  • Erongo Region
    • Karibib Constituency
      • Farm Navachab
Nörtemann et al. (2000) +1 other reference
Pacific Ocean
 
  • East Pacific Rise
    • Juan de Fuca Ridge complex
      • Gorda Ridge
        • Southern Gorda Ridge
Eos Trans. AGU (48) +1 other reference
Poland
 
  • Lower Silesian Voivodeship
    • Jawor County
      • Gmina Bolków
Mikulski (2005, January)
Mikulski (2005)
Siuda (2001)
    • Ząbkowice Śląskie County
      • Gmina Złoty Stok
        • Złoty Stok
          • Szlakowa Dolina
            • Złoty Jar
Mikulski (2013)
Portugal
 
  • Évora
    • Montemor-o-Novo
      • Santiago do Escoural
São Pedro et al. (2026)
  • Guarda
    • Vila Nova de Foz Côa
      • Numão
Leal et al. (2022)
  • Vila Real
    • Boticas
      • Ardãos e Bobadela
Fuertes-Fuente et al. (2011) +1 other reference
  • Viseu
    • Lamego
      • Magueija e Pretarouca
        • Bigorne
Leal et al. (2019) +1 other reference
Romania
 
  • Bihor County
    • Nucet
Extra Lapis English No. 5 Gold
  • Caraş-Severin County
Cook et al. (2002)
Russia
 
  • Belgorod Oblast
    • Kursk Magnetic Anomaly group
Chernyshov et al. (2009, November)
  • Chelyabinsk Oblast
    • Plastovsky District
      • Plast
        • Kochkar' District
Vikentyev (2015)
  • Chukotka Autonomous Okrug
    • Bilibinsky District
Nagornaya et al. (2020)
  • Kabardino-Balkaria
    • Elbrussky District
      • Tyrnyauz Urban Settlement
extraLapis "Gold" issue
  • Magadan Oblast
Volkov et al. (2013)
    • Khasynsky District
Savva et al. (2022)
Litvinenko Ivan Stepanovych (2020)
    • Tenkinsky District
Savva et al. (2022)
Goryachev (2001)
  • Murmansk Oblast
    • Polyarnyy
Kalinin et al. (2024)
  • Primorsky Krai
    • Dalnerechensky District
      • Malinovsky cluster
Grebennikova et al. (2023)
Grebennikova et al. (2023)
  • Republic of Karelia
    • Kostomuksha City District
      • Kostomuksha Fe deposit
Kuleshevich et al. (2008)
    • Pryazhinsky District
Ivashchenko et al. (2018, June) +1 other reference
  • Sakha
    • Indigirka River Basin
      • Sana-Maltan ore field
Savva et al. (2022)
    • Tenkeli Au-W-Sn district
Gamyanin +6 other references
    • Tyry River
Bortnikov et al. (2007)
  • Zabaykalsky Krai
    • Gazimuro-Zavodsky District
      • Lugokan ore cluster
Redin et al. (2015)
Redin et al. (2015)
Gvozdev et al. (2020)
    • Tungokochensky District
      • Vershino-Darasunskiy
Spiridonov et al. (2010) +1 other reference
Slovakia
 
  • Košice Region
    • Gelnica District
      • Henclová
Ferenc et al. (2024)
South Africa
 
  • Mpumalanga
    • Ehlanzeni District Municipality
      • Mbombela Local Municipality
        • Barberton
Otto et al. (2008)
  • North West
    • Bojanala Platinum District Municipality
      • Rustenburg Local Municipality
        • Rustenburg
Verryn et al. (1991)
Spain
 
  • Andalusia
    • Almería
      • Cuevas del Almanzora
        • Sierra Almagrera
Andres Navarro Flores collection
    • Huelva
      • Cala
Calvo Rebollar (2003)
  • Asturias
    • Salas
Cepedal et al. (2006)
  • Galicia
    • A Coruña
      • Malpica
Minero (2014)
Sweden
 
  • Jönköping County
    • Vetlanda
      • Alseda
Jonas Börje Lundin (2015)
Ukraine
 
  • Kirovohrad Oblast
    • Kropyvnytskyi Raion
O.K.Babynin et al. (2006)
  • Odesa Oblast
    • Podilsk Raion
Bobrov et al. (2006, August) +1 other reference
USA
 
  • Alaska
    • Fairbanks North Star Borough
      • Fairbanks Mining District
- (2008)
    • Southeast Fairbanks Census Area
      • Goodpaster Mining District
        • Liese Creek Prospects
Rombach et al. (2002, October) +1 other reference
Illig (2015)
  • California
    • El Dorado County
      • Placerville Mining District
        • Placerville (Hangtown)
          • Coon Hollow
Murdoch (1966) +3 other references
  • Colorado
...
  • Idaho
    • Custer County
      • Washington Basin Mining District
Ream (1995)
  • North Carolina
Wilson
Uzbekistan
 
  • Navoiy
    • Central Kyzylkum Region
      • Zarafshan
        • Muruntau ore field
Koneev et al. (2005)
  • Samarqand
    • North Nuratau Mountains
      • Zarmitan
Eshimov et al. (1987) +2 other references
  • Tashkent Region
    • Ohangaron District
Eleonora A. Dunin-Barkovskaya et al. (2005)
GEOCHMISTRY
Zimbabwe
 
  • Mashonaland East
    • Goromonzi District
Oberthür et al. (2008)
  • Masvingo
    • Masvingo District
Blenkinsop et al. (1996) +1 other reference
 
and/or  
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