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Benjaminite

A valid IMA mineral species - grandfathered
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About BenjaminiteHide

Formula:
Ag3Bi7S12
Ag may be replaced by minor Cu and Bi by minor Pb.
Colour:
Grey; tarnishes dull or yellow to copper-red
Lustre:
Metallic
Hardness:
Specific Gravity:
6.34
Crystal System:
Monoclinic
Name:
For Marcus Benjamin (1857-1932), American chemist, engineer, and editor of the U.S. National Museum (Smithsonian Institute).
Cu-rich and Cu-poor varieties are described by Makovicky et al. (2010).

Difficult to distinguish from pavonite; single-crystal XRD methods are necessary (Harris & Chen, 1975).


Unique IdentifiersHide

Mindat ID:
625
Long-form identifier:
mindat:1:1:625:9
GUID
(UUID V4):
d584a133-4d80-4083-bbae-0d01ab549f98

IMA Classification of BenjaminiteHide

Approved, 'Grandfathered' (first described prior to 1959)
First published:
1925

Classification of BenjaminiteHide

2.JA.05e

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
J : Sulfosalts of PbS archetype
A : Galena derivatives with little or no Pb
3.8.10.3

3 : SULFOSALTS
8 : 1 < ø < 2
5.7.39

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
7 : Sulpharsenites etc. of Pb and other metals

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
BnjIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
BnjThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Pronunciation of BenjaminiteHide

Pronunciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Physical Properties of BenjaminiteHide

Metallic
Transparency:
Opaque
Colour:
Grey; tarnishes dull or yellow to copper-red
Streak:
Dull lead-gray
Hardness:
3½ on Mohs scale
Hardness:
VHN50=186 - 232 kg/mm2 - Vickers
Cleavage:
Imperfect/Fair
Fair in one direction.
Density:
6.34 g/cm3 (Measured)    6.68 g/cm3 (Calculated)

Optical Data of BenjaminiteHide

Anisotropism:
Strong
Reflectivity:
WavelengthR1R2
400nm44.2% 47.2%
420nm44.8% 47.8%
440nm45.2% 48.6%
460nm45.2% 49.0%
480nm45.0% 49.2%
500nm44.8% 49.2%
520nm44.5% 49.0%
540nm44.0% 48.6%
560nm43.6% 48.0%
580nm43.3% 47.6%
600nm43.1% 47.2%
620nm43.0% 46.8%
640nm42.8% 46.3%
660nm42.7% 45.9%
680nm42.6% 45.6%
700nm42.5% 45.2%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 49.2%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Creamy white to very pale brownish
Pleochroism:
Non-pleochroic

Chemistry of BenjaminiteHide

Mindat Formula:
Ag3Bi7S12

Ag may be replaced by minor Cu and Bi by minor Pb.

Crystallography of BenjaminiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 13.25(2) Å, b = 4.05(1) Å, c = 20.25(3) Å
β = 103.14(7)°
Ratio:
a:b:c = 3.272 : 1 : 5
Unit Cell V:
1,058.21 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Massive and laths.
Twinning:
Commonly polysynthetic.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005170BenjaminiteMakovicky E, Mumme W G (1979) The crystal structure of benjaminite Cu.5Pb.4Ag2.3Bi6.8S12 The Canadian Mineralogist 17 607-61819790293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.539 Å(80)
3.427 Å(80)
3.302 Å(50)
2.851 Å(100)
2.813 Å(60)
2.022 Å(60)
2.007 Å(60)
Comments:
Camsell River, Canada. Easily mistaken for pavonite.

Geological EnvironmentHide

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

Type Occurrence of BenjaminiteHide

General Appearance of Type Material:
Large and small bunches and blotches in quartz. Irregular masses up to 5 cm.
Place of Conservation of Type Material:
Royal Ontario Museum, Toronto, Canada, 13805; Harvard University, Cambridge, Massachusetts, 85749; National Museum of Natural History, Washington, D.C., USA, 95058.
Geological Setting of Type Material:
In a quartz vein near the contact of a soda-granite and an intrusive rhyolite.
Associated Minerals at Type Locality:
Reference:
Shannon, E.V. (1925): Benjaminite, a new sulfosalt mineral of the klaprothite group. Proceedings of the U.S. National Museum, 65(24), 1-9.

Other Language Names for BenjaminiteHide

Relationship of Benjaminite to other SpeciesHide

Other Members of this group:
CupromakopavoniteAg3Cu8Pb4Bi19S38Mon. 2/m : B2/m
CupromakovickyiteCu4AgPb2Bi9S18Mon. 2/m : B2/m
CupropavoniteCu0.9Ag0.5Pb0.6Bi2.5S5 Mon. 2/m : B2/m
DantopaiteAg5Bi13S22Mon. 2/m : B2/m
LuboržákiteMn2AsSbS5Mon. 2/m : B2/m
MakovickyiteCu1.12Ag0.81Pb0.27Bi5.35S9Mon. 2/m
MummeiteCu0.58Ag3.11Pb1.10Bi6.65S13Mon.
PavoniteAgBi3S5Mon. 2/m : B2/m

Common AssociatesHide

Associated Minerals Based on Photo Data:
7 photos of Benjaminite associated with QuartzSiO2
4 photos of Benjaminite associated with BismuthBi
4 photos of Benjaminite associated with MatilditeAgBiS2
3 photos of Benjaminite associated with UM1988-05-S:AgBiCuHgPb(Hg,Ag,Cu,Pb)5Pb5Bi11S27
3 photos of Benjaminite associated with CupropavoniteCu0.9Ag0.5Pb0.6Bi2.5S5
3 photos of Benjaminite associated with GustaviteAgPbBi3S6
2 photos of Benjaminite associated with PyriteFeS2
2 photos of Benjaminite associated with ChalcopyriteCuFeS2
1 photo of Benjaminite associated with BismuthiniteBi2S3
1 photo of Benjaminite associated with PyrrhotiteFe1-xS

Related Minerals - Strunz-mindat GroupingHide

2.JA.FerdowsiiteAg8(Sb5As3)S16Mon. 2/m : P21/b
2.JA.SangenaroiteAg8(Sb8-xAsx)SΣ16 Mon. 2/m
2.JA.LuboržákiteMn2AsSbS5Mon. 2/m : B2/m
2.JA.05gBorodaeviteAg5(Bi,Pb,Fe)8(Sb,Bi)2S17Mon.
2.JA.05aCupropavoniteCu0.9Ag0.5Pb0.6Bi2.5S5 Mon. 2/m : B2/m
2.JA.05iLivingstoniteHgSb4S6(S2)Mon. 2/m : B2/b
2.JA.05dMakovickyiteCu1.12Ag0.81Pb0.27Bi5.35S9Mon. 2/m
2.JA.05fMummeiteCu0.58Ag3.11Pb1.10Bi6.65S13Mon.
2.JA.05aPavoniteAgBi3S5Mon. 2/m : B2/m
2.JA.05bGrumipluciteHgBi2S4Mon. 2/m : B2/m
2.JA.05hMozgovaitePbBi4S7Orth. mmm (2/m 2/m 2/m)
2.JA.05dCupromakovickyiteCu4AgPb2Bi9S18Mon. 2/m : B2/m
2.JA.05cKudriavite(Cd,Pb)Bi2S4Mon. 2/m : B2/m
2.JA.05aCupromakopavoniteAg3Cu8Pb4Bi19S38Mon. 2/m : B2/m
2.JA.05DantopaiteAg5Bi13S22Mon. 2/m : B2/m
2.JA.05SelenodantopaiteAg5Bi13Se22Mon. 2/m : B2/m
2.JA.10aCuprobismutiteCu8AgBi13S24Mon. 2/m : B2/m
2.JA.10cHodrušiteCu8Bi12S22Mon. 2/m
2.JA.10ePadĕraiteCu7[(Cu,Ag)0.33Pb1.33Bi11.33]S22Mon. 2/m : P21/m
2.JA.10dPizgrischite(Cu,Fe)Cu14PbBi17S35Mon. 2/m : B2/m
2.JA.10bKupčíkiteCu3.4Fe0.6Bi5S10Mon. 2/m : B2/m
2.JA.15SchapbachiteAg0.4Pb0.2Bi0.4SIso. m3m (4/m 3 2/m) : Fm3m
2.JA.15CuboargyriteAgSbS2Iso. m3m (4/m 3 2/m)
2.JA.20BohdanowicziteAgBiSe2Trig. 3m (3 2/m) : P3m1
2.JA.20MatilditeAgBiS2Trig. 3 2 : P31 2 1
2.JA.20VolynskiteAgBiTe2Trig. 3m (3 2/m) : P3m1

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 BenjaminiteHide

References for BenjaminiteHide

Reference List:

Localities for BenjaminiteHide

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.

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
 
  • Jujuy Province
    • Rinconada Department
      • Mina Pirquitas
Coira et al. (1995) +1 other reference
          • San Miguel Open pit
Paar et al. (2000)
  • Salta Province
    • Los Andes department
      • San Antonio de los Cobres
        • Organullo mining district
DE BRODTKORB +2 other references
Australia
 
  • New South Wales
    • Clive Co.
      • Bolivia
Mineralogical Society of America - ... +1 other reference
  • South Australia
    • Mt Lofty Ranges
      • South Mt Lofty Ranges (Adelaide Hills)
        • Cherry Gardens
Grguric et al. (2017)
Austria
 
  • Carinthia
    • Spittal an der Drau District
      • Großkirchheim
        • Zirknitz
          • Kleine Zirknitz valley
            • Kluidscharte
Paar et al. (1982) +1 other reference
      • Rennweg am Katschberg
        • Pölla valley
          • Lanisch
Auer (2021)
  • Salzburg
    • St. Johann im Pongau District
      • Bad Hofgastein
Makovicky et al. (2010)
Belgium
 
  • Wallonia
    • Liège
      • Eupen
        • Ternell
Godfroid (1999) +2 other references
Bolivia
 
  • La Paz
    • Aroma Province
      • Laurani District
Kempff et al. (La Paz, 2009)
  • Oruro
    • Cercado Province
      • Oruro
Keutsch et al. (2007) +1 other reference
  • Potosí
    • Sud Lípez Province
      • Cerro Bonete
Federico Ahlfeld and Alejandro Schneider-Scherbina (1964)
USGS Bulletin # 1975 (1992)
Mineralogical Society of America - ...
Brazil
 
  • Minas Gerais
    • Mariana
      • Passagem de Mariana district
Oberthür et al. (2008)
Bulgaria
 
  • Sofia Province
    • Etropole Municipality
www.bgd.bg (n.d.) +1 other reference
Canada (TL)
 
  • Northwest Territories
    • Camsell River area
Shannon (1924) +3 other references
  • Ontario
    • Timiskaming District
      • Cobalt-Gowganda region
        • South Lorrain Township
Nuffield (1953) +2 other references
China
 
  • Guangxi
    • Hechi
      • Nandan County
        • Dachang Sn-polymetallic ore field
Yingchen Ren (1999)
  • Inner Mongolia
    • Chifeng City (Ulanhad League; Chifeng Prefecture)
      • Linxi County
Yuhua Xie and Jiayin Zhang (1990)
  • Jiangsu
    • Nanjing
      • Jiangning District
Xiangping et al. (2001)
Germany
 
  • Baden-Württemberg
    • Freiburg Region
      • Ortenaukreis
        • Oberwolfach
Blaß et al. (2001) +1 other reference
        • Zell am Harmersbach
          • Nordrach
            • Moosbach valley
Staude et al. (2010)
    • Karlsruhe Region
      • Freudenstadt
        • Bad Rippoldsau-Schapbach
Staude et al. (2010)
Japan
 
  • Hyogo Prefecture
    • Asago City
      • Ikuno-cho-ono
The Mineral Species of Japan (5th ed) +1 other reference
Mineralogical Society of America - ...
Mineralogical Society of America - ...
Kazakhstan
 
  • Akmola Region
Kovalev et al. (2018)
Norway
 
  • Telemark
    • Tokke
Kvamsdal (2023)
      • Skafså
Larsen et al. (2018)
Larsen et al. (2018)
Kvamsdal (2023)
Poland
 
  • Lower Silesian Voivodeship
    • Kamienna Góra County
      • Gmina Kamienna Góra
        • Rędziny
Gołębiowska B. et al. (Ag) +1 other reference
Romania
 
  • Bihor County
    • Nucet
www.minerals-of-the carpathians.eu (2009)
  • Maramureș County
    • Băiuț
Nigel G. Cook : "Bismuth Sulphosalts ...
Russia
 
  • Primorsky Krai
    • Kavalerovsky District
      • Karadubsky ore field
www.fegi.ru (2001)
  • Sakha
    • Indigirka River Basin
      • Ust'-Nera
Jambor et al. (1994)
Slovakia
 
  • Banská Bystrica Region
    • Poltár District
      • Kokava nad Rimavicou
Ferenc Š et al. (Kokava nad Rimavicou)
    • Žarnovica District
      • Hodruša-Hámre
        • Hodruša-Hámre mines
Jeleň et al. (2012)
  • Košice Region
    • Košice-okolie District
      • Medzev
As-Co mineralization in Medzev area +1 other reference
    • Rožňava District
Koděra (1986)
    • Sobrance District
Bacsó
    • Trebišov District
Kaličiak
  • Žilina Region
    • Liptovský Mikuláš District
Ozdin D.
Sweden
 
  • Värmland County
    • Säffle
Tajikistan
 
  • Gorno-Badakhshan
    • Pamir Silver District
      • Bazardara ore cluster
Pavlova et al. (2009)
  • Sughd
    • Ghafurov District
      • Adrasmon (Adrasman)
Safonov et al. (2000) +1 other reference
    • Mastchoh District
Lur'ye et al. (1971)
Ukraine
 
  • Zakarpattia Oblast
    • Berehove Raion
      • Berehove
Biruk et al. (2012)
USA
 
  • Colorado
    • Clear Creek County
      • Alice Mining District (Yankee Mining District; Lincoln Mining District)
Eckel et al. (1997)
Hanson et al. (Rusty)
      • Montezuma (Summit Co.)
        • Cinnamon Gulch
Eckel et al. (1997)
    • Ouray County
      • Ouray Mining District
        • Gold Hill
U.S. Geological Survey Professional ...
    • Park County
      • Montezuma Mining District
        • Hall Valley (Hall's Valley)
Eckel et al. (1997)
    • San Juan County
      • Poughkeepsie Gulch
Mineralogical Society of America - ...
Karup-Møller (1977) +1 other reference
    • Summit County
Eckel et al. (1997)
  • Montana
    • Jefferson County
      • Whitehall Mining District (Cardwell Mining District)
Economic Geology (1996) +1 other reference
  • Nevada
    • Nye County
      • Toquima Range
        • Round Mountain Mining District
Shannon (1924) +3 other references
  • New Mexico
    • Santa Fe County
      • Old Placers District
Maynard (2014)
  • Utah
    • Utah County
      • East Tintic Mining District
SEM-EDS analyzed by Dr. Rob Bowell.
Uzbekistan
 
  • Tashkent Region
    • Ohangaron District
Kovalenker et al. (1997)
 
Mineral and/or Locality  
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