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Benleonardite

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Formula:
[Ag6(Sb,As)2S6Te] [Ag9Cu(S,Te)2Te2]
Colour:
dark grey, black
Lustre:
Metallic
Hardness:
3
Specific Gravity:
7.76 (Calculated)
Crystal System:
Trigonal
Name:
Named in 1986 by Chris J. Stanley, Alan J. Criddle, and James E. Chisholm in honor of Dr. Benjamin Franklin Leonard III [May 12, 1921 Dobbs Ferry, New York, USA - 2008 McCall, Idaho, USA], mineralogist and geologist with the United States Geological Survey, Denver Colorado
This page provides mineralogical data about Benleonardite.


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Classification of BenleonarditeHide

Approved
Approval Year:
1985
2.LA.50

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
L : Unclassified Sulfosalts
A : Without essential Pb
3.1.10.1

3 : SULFOSALTS
1 : ø > 4
5.2.23

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

Physical Properties of BenleonarditeHide

Metallic
Transparency:
Opaque
Colour:
dark grey, black
Hardness:
Hardness:
VHN25=105 - 125 kg/mm2 - Vickers
Density:
7.76 g/cm3 (Calculated)

Optical Data of BenleonarditeHide

Type:
Anisotropic
Anisotropism:
Moderate to strong in tints of brown, blue and grey
Reflectivity:
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

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

Crystallography of BenleonarditeHide

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
P3m1
Setting:
P3m1
Cell Parameters:
a = 7.623(1) (Å)(5) Å, c = 12.708(1) (Å)(5) Å
Ratio:
a:c = 1 : 1.667
Unit Cell V:
639.5 ų
Z:
1
Morphology:
Crusts and fracture fillings, grains and laths to 60 microns.

Twinning:
Some simple law

X-Ray Powder DiffractionHide

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

Type Occurrence of BenleonarditeHide

Place of Conservation of Type Material:
British Museum of Natural History
Geological Setting of Type Material:
Fractures in an intensely silicified rhyolitic vitrophyre.

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:
Hessite6 photos of Benleonardite associated with Hessite on mindat.org.
Quartz2 photos of Benleonardite associated with Quartz on mindat.org.
Cervelleite2 photos of Benleonardite associated with Cervelleite on mindat.org.
Acanthite1 photo of Benleonardite associated with Acanthite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.LA.10DervilliteAg2AsS2Mon. 2/m : P2/b
2.LA.15DaomaniteCuPtAsS2Orth.
2.LA.20VaughaniteTlHgSb4S7Tric.
2.LA.25CriddleiteTlAg2Au3Sb10S10Mon.
2.LA.30Fettelite[Ag6As2S7][Ag10HgAs2S8] Mon. 2 : B2
2.LA.35Chaméanite(Cu,Fe)4As(Se,S)4Iso.
2.LA.40ArcubisiteAg6CuBiS4
2.LA.45MgriiteCu3AsSe3
2.LA.55TsnigriiteAg9SbTe3(S,Se)3Mon.
2.LA.60BorovskitePd3SbTe4Iso.
2.LA.65JonassoniteAuBi5S4Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

5.2.1SmithiteAgAsS2Mon. 2/m
5.2.2TrechmanniteAgAsS2Trig.
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
5.2.7ArgentotennantiteAg6[Cu4(Fe,Zn)2]As4S13Iso. 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
5.2.15FreibergiteAg6[Cu4Fe2]Sb4S13-xIso. 4 3m : I4 3m
5.2.16AramayoiteAg3Sb2(Bi,Sb)S6Tric. 1 : P1
5.2.17MatilditeAgBiS2Hex.
5.2.18SchapbachiteAg0.4Pb0.2Bi0.4SIso.
5.2.19PavoniteAgBi3S5Mon. 2/m : B2/m
5.2.20ArcubisiteAg6CuBiS4
5.2.21BohdanowicziteAgBiSe2Trig. 3m (3 2/m) : P3m1
5.2.22SelenostephaniteAg5Sb(Se,S)4Orth.
5.2.24VolynskiteAgBiTe2Orth.

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)
American Mineralogist: 73: 439.
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.
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.

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.
Austria
 
  • Salzburg
    • Lungau
      • Murwinkel
        • Rotgülden
Horner, J., Neubauer, F., Paar, W.H., Hansmann, W., Koeppel, V., and Robl, K. (1997): Mineralium Deposita 32, 555-568.
  • Styria
    • Birkfeld
      • 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.
Canada
 
  • Ontario
    • Kenora District
      • Balmer Township
Rocks & Minerals 79:2 pp94-99
Egypt
 
  • Red Sea Governorate
    • 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
Fiji
 
  • Viti Levu
    • 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
Italy
 
  • Piedmont
    • Verbano-Cusio-Ossola Province
      • Ossola Valley
        • Antigorio Valley
          • Devero Valley
            • 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.
Japan
 
  • Honshu Island
    • Chubu Region
      • Shizuoka Prefecture
        • Shimoda City
          • Rendaiji
(unpublished species lists maintained by local collectors; needs confirmation)
Mexico (TL)
 
  • Sonora
    • Mun. de Moctezuma
      • Moctezuma
Mineralogical Magazine(1986) 50, 681-686
A. J. Criddle, J. E. Chisholm & C. J. Stanley (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. Geochem. Mineral. Petrol.(Bulg. Acad. Sci.), 42, 1-22.
Romania
 
  • Maramureș Co.
    • Cavnic (Kapnic; Kapnik)
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,
Slovakia
 
  • 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
    • Žiar nad Hronom Co.
Ďuďa R., 1993 : Die mineralien der Gold und Silber - lagersttäte von Kremnitz ( Kremnica) in der Slowakei. Mineralien Welt /Haltern,Nemecko/,5, s. 20 - 32
Sweden
 
  • Västerbotten
    • Skellefteå
      • Boliden
UK
 
Tindle, A.G. (2008) Minerals of Britian and Ireland
USA
 
  • 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 District (Whitehall District)
Mineralogical Magazine 1996 60 : 871-876
  • Utah
    • Utah Co.
      • East Tintic Mts
        • East Tintic District
EDS by Dr. Rob Bowell.
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