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About BenleonarditeHide

Benjamin F. Leonard III
[Ag6(Sb,As)2S6Te] [Ag9Cu(S,Te)2Te2]
dark grey, black
Specific Gravity:
7.76 (Calculated)
Crystal System:
Named in 1986 by Chris J. Stanley, Alan J. Criddle, and James E. Chisholm in honor of Dr. Benjamin Franklin Leonard III (12 May 1921 Dobbs Ferry, New York, USA - 5 Septermber 2008 McCall, Idaho, USA), mineralogist and geologist with the United States Geological Survey, Denver Colorado. He was a leading expert in ore microscopy. He discovered and described the new minerals paradocrasite and polhemusite, and co-authored descriptions of four other new minerals. The Eocene larch, Larix leonardii, is also named in his honor.
This page provides mineralogical data about Benleonardite.

Classification of BenleonarditeHide

Approval Year:
First Published:

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
L : Unclassified Sulfosalts
A : Without essential Pb

1 : ø > 4

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
2 : Sulpharsenites etc. of Ag

Physical Properties of BenleonarditeHide

dark grey, black
VHN25=105 - 125 kg/mm2 - Vickers
7.76 g/cm3 (Calculated)

Optical Data of BenleonarditeHide

Moderate to strong in tints of brown, blue and grey
400nmR1=35.6%R2= 36.8%
420nmR1=35.7%R2= 36.6%
440nmR1=35.8%R2= 36.2%
460nmR1=35.7%R2= 35.6%
480nmR1=35.5%R2= 34.9%
500nmR1=35.1%R2= 34.1%
520nmR1=34.7%R2= 33.2%
540nmR1=34.1%R2= 32.2%
560nmR1=33.5%R2= 31.4%
580nmR1=32.9%R2= 30.7%
600nmR1=32.4%R2= 30.0%
620nmR1=32.0%R2= 29.5%
640nmR1=31.6%R2= 29.1%
660nmR1=31.4%R2= 28.7%
680nmR1=31.1%R2= 28.4%
700nmR1=30.8%R2= 28.1%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 36.8%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Pale blue

Chemical Properties of BenleonarditeHide

[Ag6(Sb,As)2S6Te] [Ag9Cu(S,Te)2Te2]
IMA Formula:
Idealised Formula:
Ag15Cu(Sb, As)2S7Te4
Common Impurities:

Crystallography of BenleonarditeHide

Crystal System:
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
Cell Parameters:
a = 7.623(1) (Å)(5) Å, c = 12.708(1) (Å)(5) Å
a:c = 1 : 1.667
Unit Cell V:
639.5 ų
Crusts and fracture fillings, grains and laths to 60 microns.

Some simple law

X-Ray Powder DiffractionHide

Powder Diffraction Data:
12.7 Å(70)
3.188 Å(30)
2.936 Å(100)
2.328 Å(20)
2.863 Å(25)
2.608 Å(35)
2.158 Å(35)
Moctezuma mine, Mexico.

Type Occurrence of BenleonarditeHide

General Appearance of Type Material:
Thin black crusts
Place of Conservation of Type Material:
British Museum of Natural History, polished mount E.1161; BM 1985, 354.
Geological Setting of Type Material:
Fractures in an intensely silicified rhyolitic vitrophyre.
Stanley, C.J., Criddle, A.J. and Chisholm, J.E. (1986) Benleonardite, a new mineral from the Bambolla mine, Moctezuma, Sonora, Mexico. Mineralogical Magazine: 50: 681–686.

Synonyms of BenleonarditeHide

Other Language Names for BenleonarditeHide

Relationship of Benleonardite to other SpeciesHide

Other Members of this group:
Cupropearceite[Cu6As2S7][Ag9CuS4]Trig. 3m (3 2/m) : P3m1
Cupropolybasite[Cu6Sb2S7][Ag9CuS4]Trig. 3m : P3 1m
Pearceite[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]Trig. 3m (3 2/m) : P3m1
Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]Mon. 2/m : B2/m
Selenopolybasite[(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2]Trig. 3m (3 2/m) : P3m1

Common AssociatesHide

Associated Minerals Based on Photo Data:
6 photos of Benleonardite associated with HessiteAg2Te
2 photos of Benleonardite associated with QuartzSiO2
2 photos of Benleonardite associated with CervelleiteAg4TeS
1 photo of Benleonardite associated with AcanthiteAg2S

Related Minerals - Nickel-Strunz GroupingHide

2.LA.10DervilliteAg2AsS2Mon. 2/m : P2/b
2.LA.30Fettelite[Ag6As2S7][Ag10HgAs2S8] Mon. 2 : B2
2.LA.45MgriiteCu3AsSe3Iso. m3m (4/m 3 2/m)

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

5.2.1SmithiteAgAsS2Mon. 2/m
5.2.3ProustiteAg3AsS3Trig. 3m (3 2/m) : R3c
5.2.4XanthoconiteAg3AsS3Mon. 2/m : B2/b
5.2.5Pearceite[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]Trig. 3m (3 2/m) : P3m1
5.2.6Pearceite-T2acTrig. 3 2 : P3 2 1
5.2.7Argentotennantite-(Zn)Ag6(Cu4Zn2)As4S12SIso. 4 3m : I4 3m
5.2.8MiargyriteAgSbS2Mon. 2/m : B2/b
5.2.9PyrargyriteAg3SbS3Trig. 3m : R3c
5.2.10PyrostilpniteAg3SbS3Mon. 2/m : P21/b
5.2.11StephaniteAg5SbS4Orth. mm2 : Cmc21
5.2.12Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]Mon. 2/m : B2/m
5.2.13BillingsleyiteAg7AsS6Iso. 2 3 : P21 3
5.2.14Polybasite-TacTrig. 3m (3 2/m) : P3m1
5.2.15Freibergite Subgroup([Ag6]4+,(Ag,Cu)6)((Cu,Ag)4X2+2)Sb4S12S0-1
5.2.16AramayoiteAg3Sb2(Bi,Sb)S6Tric. 1 : P1
5.2.17MatilditeAgBiS2Trig. 3m (3 2/m) : P3m1
5.2.19PavoniteAgBi3S5Mon. 2/m : B2/m
5.2.21BohdanowicziteAgBiSe2Trig. 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.

References for BenleonarditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Stanley, C.J., Criddle, A.J. and Chisholm, J.E. (1986) Benleonardite, a new mineral from the Bambolla mine, Moctezuma, Sonora, Mexico. Mineralogical Magazine: 50: 681–686.
Jambor, J.L., Grew, E.S., Puziewics, J., Vanko, D.A. (1988) New mineral names. American Mineralogist: 73: 439-445.
Spry, P.G. and Thieben, S.E. (1996) Two new occurrences of benleonardite, a rare silver–tellurium sulphosalt, and a possible new occurrence of cervelleite. Mineralogical Magazine: 60: 871–876.
Bindi, L., Stanley, C., Spry, P.G. (2015) New structural data reveal benleonardite to be a member of the pearceite-polybasite group. Mineralogical Magazine: 79: 1213–1221.
Hålenius, U., Hatert, F., Pasero, M., Mills, S.J. (2015) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) Newsletter 28. New minerals and nomenclature modifications approved in 2015. Mineralogical Magazine: 79: 1859-1864.

Internet Links for BenleonarditeHide

Localities for BenleonarditeHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • San Luis Province
    • Coronel Pringles Department
Gallard-Esquivel, M. C., Cepedal, A., Fuertes-Fuente, M., & Martin-Izard, A. (2018) Enrichment in critical metals (In-Ge) and Te-Se in epithermal deposits of the ‘La Carolina’district, San Luis, Argentina. Mineralogical Magazine, 82(S1), S61-S87.
  • Salzburg
    • Tamsweg District
      • Murwinkel
        • Rotgülden
          • Lower Rotgülden lake
- Paar, W., Putz, H. (2018): Mineralogische Notizen zur Exploration der Lagerstätte Rotgülden, Salzburg. In: Der Steirische Mineralog, Vol.33, p.32-40.
          • Silbereck - Altenbergkar area
Horner, J., Neubauer, F., Paar, W.H., Hansmann, W., Koeppel, V., and Robl, K. (1997): Mineralium Deposita 32, 555-568.
  • Styria
    • Weiz District
      • Gasen
Bojar, H.-P. et al. (1998); Bojar, H.-P. (1999): 1189. Benleonardit, Diaphorit, Hessit, Gersdorffit, Greenockit, Magnetit, Meneghinit, Ullmannit, 2 unbekannte Cd-hältige Sulfide und ein nicht näher bestimmtes Ag-hältiges Pb-Sb-Sulfosalz vom Straßegg, Breitenau am Hochlantsch, Steiermark. Pp. 228-229 in Niedermayr, G. et al. (1999): Neue Mineralfunde aus Österreich XLVIII. Carinthia II, 189./109., 201-236.
  • Manitoba
    • Snow Lake District
Duff, S. (2016). Ore Types of the Auriferous Lalor VMS Deposit, Snow Lake, Manitoba: Implications for Genesis and Post Depositional Processes (MS Thesis, Université d'Ottawa/University of Ottawa).
  • Ontario
    • Kenora District
      • Balmer Township
Rocks & Minerals 79:2 pp94-99
  • Red Sea
    • Eastern Desert
      • Um Samiuki
Ibrahim M. Shalaby, Eugen Stumpfl, Hassan M. Helmy, Mahmoud M. El Mahallawi and Omar A. Kamel (2004) Silver and silver-bearing minerals at the Um Samiuki volcanogenic massive sulphide deposit, Eastern Desert, Egypt. Mineralium Deposita Volume 39, Numbers 5-6, 608-621
  • Viti Levu
    • Vatukoula Gold Field (Tavua Gold Field)
      • Vatukoula
D. W. Pals and P. G. Spry "Telluride mineralogy of the low-sulfidation" Mineralogy and Petrology (2003) 79: 285–307
Handbook of Mineralogy
  • Piedmont
    • Verbano-Cusio-Ossola Province
      • Baceno
        • Devero Alp
Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
  • Shizuoka Prefecture
    • Shimoda City
      • Rendaiji
(unpublished species lists maintained by local collectors; needs confirmation)
Mexico (TL)
  • Sonora
    • Moctezuma Municipality
      • Moctezuma
Stanley, C.J., Criddle, A.J. and Chisholm, J.E. (1986) Benleonardite, a new mineral from the Bambolla mine, Moctezuma, Sonora, Mexico. Mineralogical Magazine: 50: 681–686.
Criddle, A.J., Chisholm, J.E., Stanley, C.J. (1989) Cervelleite, Ag4TeS, a new mineral from the Bambolla mine, Mexico, and a description of a photo-chemical reaction involving cervelleite, acanthite and hessite. European Journal of Mineralogy: 1: 371-380.; Bonev, I.K., Petrunov, R., Cook, N.J., Ciobanu, C.L. (2005) Kostovite and its argentian varieties: Deposits and mineral associations. Geochemistry, Mineralogy and Petrology (Bulgarian Academy of Sciences): 42: 1-22.
  • Hunedoara
    • Deva
George DINCĂ, Gheorghe C. POPESCU, Oana-Claudia CIOBOTEA-BARBU, Daniel BÎRGĂOANU (2018): Silver sulfotellurides and other Te-sulfosalts in alabandite-bearing veins from Săcărâmb Au-Ag-Te ore deposit, Metaliferi Mountains, Romania. Rom. J. Mineral Deposits, 91, 19-24.
  • Maramureș
    • Cavnic
Cristeastan, Daniela, Constantinescu, B., Chiojdeanu, C., Ceccato, D., Pacheco, C., & Pichon, L. (2012) Micro-Pixe And XRF Studies On Native Gold From Cavnic Ore Deposit (Baia Mare District). Rom. Journ. Phys., Vol. 57, Nos. 3–4, P. 594–606,
  • Amur Oblast
    • Urusha-Oldoi ore district
Vakh, A. S., Khomich, V. G., Boriskina, N. G., & Santosh, M. (2016). The Berezitovoe gold-polymetallic deposit (Upper Amur region, Russia): Structure, mineralogy and genetic aspects. Geoscience Frontiers, 7(3), 483-494.
  • Bashkortostan
    • Baymak-Buribay District
Maslennikov, V. V., Maslennikova, S. P., Large, R. R., Danyushevsky, L. V., Herrington, R. J., & Stanley, C. J. (2013). Tellurium-bearing minerals in zoned sulfide chimneys from Cu-Zn massive sulfide deposits of the Urals, Russia. Mineralogy and Petrology, 107(1), 67-99.
  • Banská Bystrica Region
Ďuďa R.,Kotuľak P., Káňa R., 1993: Bergbau und Mineralien von Banská Štiavnica (Schemnitz), Slowakei. Emser Hefte, 14, 3, 1-70, Haltern
    • Žarnovica District
      • Hodruša-Hámre (Hodritsch)
Berkh, K., Majzlan, J., Chovan, M., Kozák, J., & Bakos, F. (2014) Mineralogy of the Medieval Ag-Au occurrences Banská Belá, Treiboltz, Rabenstein, and Kopanice in the Banská Štiavnica ore district (Slovakia). Neues Jahrbuch für Mineralogie-Abhandlungen: Journal of Mineralogy and Geochemistry, 191(3), 237-256.
    • Žiar nad Hronom District
Ďuďa R., 1993 : Die mineralien der Gold und Silber - lagersttäte von Kremnitz ( Kremnica) in der Slowakei. Mineralien Welt /Haltern,Nemecko/,5, s. 20 - 32
  • Västerbotten County
    • Skellefteå
      • Skellefte mining district
        • Boliden
Tindle, A.G. (2008) Minerals of Britian and Ireland
  • Montana
    • Fergus Co.
      • Warm Springs District (Gilt Edge District; Gold Hill District; Maiden District)
        • Cone Butte Sub-District
Mineralogical Magazine 1996 60 : 871-876
    • Madison Co.
      • Norwegian Mining District (Whitehall Mining District)
Mineralogical Magazine 1996 60 : 871-876
  • Utah
    • Utah Co.
EDS by Dr. Rob Bowell.
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