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Benleonardite

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Formula:
Ag8(Sb,As)Te2S3
System:
Tetragonal
Colour:
dark grey, black
Lustre:
Metallic
Hardness:
3
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.

Classification of Benleonardite

Approved 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
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http://www.mindat.org/min-817.html
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Type Occurrence of Benleonardite

Place of Conservation of Type Material:
British Museum of Natural History
Year of Discovery:
1985
Geological Setting of Type Material:
Fractures in an intensely silicified rhyolitic vitrophyre.

Physical Properties of Benleonardite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
dark grey, black
Hardness (Mohs):
3
Hardness (Vickers):
VHN25=105 - 125 kg/mm2
Density:
7.76 g/cm3 (Calculated)

Crystallography of Benleonardite

Crystal System:
Tetragonal
Cell Parameters:
a = 6.603(5) Å, c = 12.726(5) Å
Ratio:
a:c = 1 : 1.927
Unit Cell Volume:
V 554.85 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crusts and fracture fillings, grains and laths to 60 microns.
Twinning:
Some simple law
X-Ray 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.

Optical Data of Benleonardite

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 Benleonardite

Formula:
Ag8(Sb,As)Te2S3
Essential elements:
All elements listed in formula:
Analytical Data:
Moctezuma mine, Mexico; by electron microprobe, average of 14 analyses.
Ag (64.5)
Cu (0.1)
Sb (7.3)
As (1.4)
Te (18.7)
S (8.0)
Total (100.0)
Empirical Formula:
Ag7.80Cu0.02(Sb0.78As0.24)Te1.90S3.25
Common Impurities:
Cu

Relationship of Benleonardite to other Species

2.LA.10DervilliteAg2AsS2
2.LA.15DaomaniteCuPtAsS2
2.LA.20VaughaniteTlHgSb4S7
2.LA.25CriddleiteTlAg2Au3Sb10S10
2.LA.30Fettelite[Ag6As2S7][Ag10HgAs2S8]
2.LA.35Chaméanite(Cu,Fe)4As(Se,S)4
2.LA.40ArcubisiteAg6CuBiS4
2.LA.45MgriiteCu3AsSe3
2.LA.55TsnigriiteAg9SbTe3(S,Se)3
2.LA.60BorovskitePd3SbTe4
2.LA.65JonassoniteAuBi5S4
5.2.1SmithiteAgAsS2
5.2.2TrechmanniteAgAsS2
5.2.3ProustiteAg3AsS3
5.2.4XanthoconiteAg3AsS3
5.2.5Pearceite[(Ag,Cu)6(As,Sb)2S7][Ag9CuS4]
5.2.6Pearceite-T2ac
5.2.7ArgentotennantiteAg6[Cu4(Fe,Zn)2]As4S13
5.2.8MiargyriteAgSbS2
5.2.9PyrargyriteAg3SbS3
5.2.10PyrostilpniteAg3SbS3
5.2.11StephaniteAg5SbS4
5.2.12Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
5.2.13BillingsleyiteAg7AsS6
5.2.14Polybasite-Tac
5.2.15FreibergiteAg6[Cu4Fe2]Sb4S13-x
5.2.16AramayoiteAg(Sb,Bi)S2
5.2.17MatilditeAgBiS2
5.2.18SchapbachiteAg0.4Pb0.2Bi0.4S
5.2.19Pavonite(Ag,Cu)(Bi,Pb)3S5
5.2.20ArcubisiteAg6CuBiS4
5.2.21BohdanowicziteAgBiSe2
5.2.22SelenostephaniteAg5Sb(Se,S)4
5.2.24VolynskiteAgBiTe2

Other Names for Benleonardite

Name in Other Languages:

Other Information

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 Benleonardite

Reference List:
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.

Internet Links for Benleonardite

Localities for Benleonardite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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
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
Min.Mag.(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
    • 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.
Mineral and/or Locality  
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