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Fischesserite

A valid IMA mineral species
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About FischesseriteHide

Formula:
Ag3AuSe2
Colour:
Black
Lustre:
Metallic
Hardness:
2
Specific Gravity:
9.05 (Calculated)
Crystal System:
Isometric
Name:
Named by Zdenek Johan, Paul Picot, Roland Pierrot, and Milan Kvacek in 1971 in honor of Raymond Fischesser (1911-1991), French mineralogist and crystallographer, Director of the National School of Mines, Paris, France.
Black equant crystals and grains, frequently as microscopic intergrowths.


Unique IdentifiersHide

Mindat ID:
1552
Long-form identifier:
mindat:1:1:1552:9

IMA Classification of FischesseriteHide

Classification of FischesseriteHide

2.BA.75

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
A : With Cu, Ag, Au
2.4.3.2

2 : SULFIDES
4 : AmBnXp, with (m+n):p = 2:1
3.3.5

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
3 : Sulphides etc. of 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
FisIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
FisThe 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 FischesseriteHide

Metallic
Transparency:
Opaque
Colour:
Black
Hardness:
Hardness:
VHN50=32.7 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Density:
9.05 g/cm3 (Calculated)

Optical Data of FischesseriteHide

Reflectivity:
WavelengthR1 (%)
420nm33.4%
440nm33.6%
460nm33.1%
480nm32.3%
500nm31.3%
520nm30.1%
540nm29.7%
560nm29.9%
580nm31.0%
600nm32.0%
620nm32.9%
640nm33.8%
660nm34.7%
680nm35.4%
700nm36.0%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 36.0%.
Colour in reflected light:
Light pink, close to the color of enargite

Chemistry of FischesseriteHide

Mindat Formula:
Ag3AuSe2
Element Weights:
Element% weight
Ag47.695 %
Se23.275 %

Calculated from ideal end-member formula.
Common Impurities:
Cu

Crystallography of FischesseriteHide

Crystal System:
Isometric
Class (H-M):
432 - Gyroidal
Space Group:
I4132
Cell Parameters:
a = 9.967 Å
Unit Cell V:
990.13 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Massive, xenomorphic grains

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005994FischesseriteBindi L, Cipriani C (2004) Structural and physical properties of fischesserite, a rare gold-silver selenide from the De Lamar mine, Owyhee County, Idaho, USA The Canadian Mineralogist 42 1733-17372004De Lamar mine, Owyhee County, Idaho, USA0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.08 Å(60)
3.50 Å(10)
3.15 Å(30)
2.877 Å(40)
2.662 Å(100)
2.349 Å(50)
2.29 Å(80)
2.035 Å(80)
1.954 Å(60)
1.820 Å(80)
1.763 Å(20)
1.708 Å(10)
1.501 Å(40)
1.469 Å(50)
1.439 Å(40)
1.410 Å(30)
1.382 Å(30)
1.332 Å(60)
1.266 Å(70)
1.246 Å(30)
1.227 Å(20)
1.159 Å(20)
1.130 Å(30)
Comments:
ICDD 25-367

Geological EnvironmentHide

Paragenetic Mode(s):

Type Occurrence of FischesseriteHide

General Appearance of Type Material:
Xenomorphic grains
Place of Conservation of Type Material:
National School of Mines, Paris, France
Geological Setting of Type Material:
Carbonate vein in epithermal precious metal hydrothermal deposit.
Associated Minerals at Type Locality:

Synonyms of FischesseriteHide

Other Language Names for FischesseriteHide

Simplified Chinese:硒金银矿

Common AssociatesHide

Associations Based on Photo Data:
19 photos of Fischesserite associated with ClausthalitePbSe
16 photos of Fischesserite associated with Native GoldAu
11 photos of Fischesserite associated with CalciteCaCO3
10 photos of Fischesserite associated with KlockmanniteCuSe
8 photos of Fischesserite associated with NaumanniteAg2Se
7 photos of Fischesserite associated with EucairiteAgCuSe
6 photos of Fischesserite associated with ChrisstanleyiteAg2Pd3Se4
4 photos of Fischesserite associated with CerussitePbCO3
4 photos of Fischesserite associated with ChlorargyriteAgCl
3 photos of Fischesserite associated with Penroseite(Ni,Co,Cu)Se2

Related Minerals - Strunz-mindat GroupingHide

2.BA.MakotoiteAg12(Cu3Au)S8Trig. 3m(32/m) : R3c
2.BA.AlburniteAg8GeTe2S4Iso.
2.BA.DzierżanowskiteCaCu2S2Trig. 3m(32/m) : P3m1
2.BA.XuwenyuaniteAg9Fe3+Te2S4Iso. 43m : F43m
2.BA.'Orileyite'(Fe,Cu)2As
2.BA.JuxingiteBi6Cu+138Cu2+2Fe3+30S125Iso. 43m : F43m
2.BA.05DjurleiteCu31S16Mon. 2/m
2.BA.05GeeriteCu8S5Trig. 3
2.BA.05RoxbyiteCu58S32Tric. 1 : P1
2.BA.05ChalcociteCu2SMon. 2/m : P21/b
2.BA.10DigeniteCu9S5Trig. 3m(32/m) : R3m
2.BA.10AniliteCu7S4Orth. mmm(2/m2/m2/m) : Pnma
2.BA.15BorniteCu5FeS4Orth. mmm(2/m2/m2/m) : Pbca
2.BA.20BellidoiteCu2SeTet. 4/m : P42/n
2.BA.20BerzelianiteCu2-xSe (x ≈ 0.12)Iso. m3m(4/m32/m) : Fm3m
2.BA.25AthabascaiteCu5Se4Orth.
2.BA.25UmangiteCu3Se2Tet. 42m : P421m
2.BA.30RickarditeCu7Te5Orth. mmm(2/m2/m2/m) : Pmmn
2.BA.30WeissiteCu2-xTeHex. 6/mmm(6/m2/m2/m) : P6/mmm
2.BA.35AcanthiteAg2SMon. 2/m : P21/m
2.BA.35SpryiteAg8(As3+0.5As5+0.5)S6Orth. mm2 : Pna21
2.BA.40d'UM2003-13-S:AgAuCu'Ag6AuCu2S5
2.BA.40MckinstryiteAg5-xCu3+xS4Orth. mmm(2/m2/m2/m) : Pnma
2.BA.40StromeyeriteAgCuSOrth. mmm(2/m2/m2/m)
2.BA.42HoneaiteAu3TlTe2 Orth. mmm(2/m2/m2/m) : Pbcm
2.BA.45JalpaiteAg3CuS2Tet. 4/mmm(4/m2/m2/m) : I41/amd
2.BA.45SelenojalpaiteAg3CuSe2Tet. 4/mmm(4/m2/m2/m) : I41/amd
2.BA.45KuriliteAg8Te3SeTrig. 3 : R3
2.BA.47Spiridonovite(Cu1-xAgx)2TeTrig. 3m(32/m) : P3c1
2.BA.50WuyanzhiiteCu2STet. 422 : P43212
2.BA.50EucairiteAgCuSeOrth.
2.BA.52'Argentite'Ag2SIso.
2.BA.55NaumanniteAg2SeOrth. 222 : P212121
2.BA.55AguilariteAg4SeSMon. 2/m
2.BA.60ChenguodaiteAg9Fe3+Te2S4Orth.
2.BA.60HessiteAg2TeMon. 2/m : P21/b
2.BA.60CervelleiteAg4TeSMon. 2/m
2.BA.65Henryite(Cu,Ag)3+xTe2 , with x ~ 0.40Iso. m3m(4/m32/m) : Fd3c
2.BA.65StütziteAg5-xTe3, x = 0.24-0.36Hex. 6 : P6
2.BA.70ArgyroditeAg8GeS6Orth. mm2 : Pna21
2.BA.70Putzite(Cu4.7Ag3.3)GeS6Iso. 43m : F43m
2.BA.70CanfielditeAg8SnS6Orth. mm2 : Pna21
2.BA.75UytenbogaardtiteAg3AuS2Trig. 3m(32/m) : R3c
2.BA.75Penzhinite(Ag,Cu)4Au(S,Se)4Hex. 622 : P6322
2.BA.75PetrovskaiteAuAgSMon.
2.BA.75PetziteAg3AuTe2Iso. 432 : I4132
2.BA.80Bezsmertnovite(Au,Ag)4Cu(Te,Pb)Orth.
2.BA.80BilibinskitePbCu2Au3Te2Iso.
2.BA.80Bogdanovite(Au,Te,Pb)3(Cu,Fe)Iso.

Fluorescence of FischesseriteHide

Not fluorescent in UV

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 FischesseriteHide

References for FischesseriteHide

Localities for FischesseriteHide

Showing 44 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.
Argentina
 
  • La Rioja Province
    • Chilecito department
      • Sañogasta
Brodtkorb (2002)
Zappettini et al. (2014) +1 other reference
    • General Lamadrid Department
Márquez-Zavalía et al. (2021)
      • Villa Castelli
        • Sierra de Cacho
De Brodtkorb (2009) +1 other reference
Zappettini (1999)
Austria
 
  • Vorarlberg
    • Bludenz District
      • Lorüns
Kolitsch et al. (2020)
Bolivia
 
  • Potosí
    • Chayanta Province
      • Colquechaca Municipality
        • Pakajake Canyon
Dr. Günter Grundmann collection
Brazil
 
  • Pará
    • Curionópolis
Berni et al. (2014) +1 other reference
Canada
 
  • Newfoundland and Labrador
    • Newfoundland
      • Burin Peninsula
Sparkes et al. (2016)
      • Wilding Lake
Conliffe et al. (2025)
  • Ontario
    • Cochrane District
      • Timmins
        • Kidd Township
Kidd Operations
Chile
 
  • Antofagasta
    • Antofagasta Province
      • Antofagasta
        • Escondida
          • La Escondida Mine
Gibbons (2018)
  • Atacama
    • Chañaral Province
      • Salitrosa-Porvenir mining district
Extra Lapis English No. 5 Gold
China
 
  • Yunnan
    • Pu'er
      • Mojiang County
Yuan Li (1998)
Czech Republic (TL)
 
  • South Bohemian Region
    • Písek District
      • Kovářov
        • Předbořice
Bull.Soc.fr.Min.Crist. (1971) +1 other reference
  • Vysočina Region
    • Žďár nad Sázavou District
      • Rožná
        • Rožná deposit
Strübel
Japan
 
  • Hokkaidō Prefecture
    • Ishikari Subprefecture
      • Sapporo City
田中崇裕・濱根大輔: ...
  • Ishikawa Prefecture
    • Hakui District
      • Shika-machi
Hamada et al. (2022)
Mexico
 
  • Guanajuato
    • Guanajuato Municipality
      • Guanajuato
Solana Espinosa +2 other references
New Zealand
 
  • Waikato Region
    • Thames-Coromandel District
      • Hikuai
        • Broken Hills
Cocker et al. (2013)
Nicaragua
 
  • León Department
English et al. (2024)
Peru
 
  • Arequipa
    • Condesuyos Province
      • Rio Grande district
Alfonso et al. (2023)
Russia
 
  • Chelyabinsk Oblast
    • Kartalinsky District
Azovskova et al. (2019)
  • Chukotka Autonomous Okrug
    • Anadyrsky District
Savva et al. (2012) +1 other reference
    • Okhotsk-Chukotka belt
Kolova et al. (2021)
  • Kamchatka Krai
    • Koryak Okrug
      • Karaginsky District
        • Maletoyvayam ore field
Kasatkin et al. (2023) +1 other reference
Spiridonov et al. (2009, April) +1 other reference
Pekov et al. (2026)
    • Yelizovsky District
Seryotkin et al. (2013)
  • Krasnoyarsk Krai
    • Western Sayan range
Kiseleva et al. (2024)
  • Republic of Karelia
    • Segezhsky District
Kuleshevich et al. (2012)
  • Tuva
    • Sut-Kholsky District
      • Aldan-Maadyr ore cluster
Kuzhuget et al. (2015) +1 other reference
Kuzhuget et al. (2022)
    • Todzhinsky District
Kuzhuget et al. (2025)
Sweden
 
  • Östergötland County
    • Valdemarsvik
Sandström (2007)
UK
 
  • England
    • Devon
      • Torbay
        • Torquay
Stanley et al. (1990) +1 other reference
USA
 
  • Idaho
    • Owyhee County
      • De Lamar Mining District
Extra Lapis English No. 5 Gold
      • Silver City Mining District (Carson Mining District)
Collins (2012)
  • Nevada
    • Elko County
      • Gold Circle Mining District (Midas Mining District)
Castor et al. (2004)
Castor et al. (2004)
Castor et al. (2004) +1 other reference
Tharalson +5 other references
    • Lander County
      • Buffalo Valley Mining District
        • Buffalo Valley mine
Reid et al. (2010)
  • Washington
    • Chelan County
      • Wenatchee Mining District
Lasmanis (1995)
 
and/or  
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