Mineralogy Database

Benleonardite Mineral Data

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General Benleonardite Information

Help on Chemical  Formula: Chemical Formula: Ag8(Sb,As)Te2S3
Help on Composition: Composition: Molecular Weight = 1,312.68 gm
   Silver     65.74 %  Ag
   Antimony    4.64 %  Sb
   Tellurium  19.44 %  Te
   Arsenic     2.85 %  As
   Sulfur      7.33 %  S
             100.00 % 
Help on Empirical Formula: Empirical Formula: Ag8Sb0.5As0.5Te2S3
Help on IMA Status: IMA Status: Approved IMA 1986
Help on Locality: Locality: Moctezuma mine, Moctezuma, Sonora, Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Benjamin F. Leonard (1921-), U.S. Geologist.
Help on Name Pronunciation: Name Pronunciation: Benleonardite + Pronunciation Say BENLEONARDITE

Benleonardite Image

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Comments: Gray-black benleonardite on hessite.
Location: Moctezuma, Sonora, Mexico. Scale: Specimen Size 2x3 cm.
© Diederik Visser

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Comments: B&W polished section image of a bladed and an irregular mass of benleonardite (b) intergrown with hessite (h). (MinMag, v60:403).
Location: Gies and Mayflower epithermal gold-silver telluride deposits, Montana, USA. Scale: See Image.
© Mineralogical Magazine

Benleonardite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.9273
Help on Cell Dimensions: Cell Dimensions: a = 6.603, c = 12.726, Z = 2; V = 554.85 Den(Calc)= 7.86
Help on Crystal System: Crystal System: Tetragonal Space Group: Tetra
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.936(1), 12.7(0.7), 2.608(0.35),

Physical Properties of Benleonardite

Help on Color: Color: Gray, Black.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Metallic

Optical Properties of Benleonardite

Help on Optical Data: Optical Data: NCalc= 2.32 - from Gladstone-Dale relationship (KC = 0.1675) where Ncalc=Dcalc*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Moderate to strong, in tints of brown, blue, and gray.
Help on RL Color: RL Color: Very pale blue.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Benleonardite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   35.60   36.80 
 420 nm   35.70   36.60 
 440 nm   35.80   36.20 
 460 nm   35.70   35.60 
 480 nm   35.50   34.90 
 500 nm   35.10   34.10 
 520 nm   34.70   33.20 
 540 nm   34.10   32.20 
 560 nm   33.50   31.40 
 580 nm   32.90   30.70 
 600 nm   32.40   30.00 
 620 nm   32.00   29.50 
 640 nm   31.60   29.10 
 660 nm   31.40   28.70 
 680 nm   31.10   28.40 
 700 nm   30.80   28.10 
Calculated Relative Intensity Colors of Benleonardite in Air
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 270% 290%

Calculated Properties of Benleonardite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.83 gm/cc
note: Specific Gravity of Benleonardite =7.86 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEBenleonardite = 259.44 barns/electron
U=PEBenleonardite x rElectron Density=1,770.95 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Benleonardite is Not Radioactive

Benleonardite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.01)where z/y > 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.01.10)Dana Group Benleonardite Ag8(Sb,As)Te2S3 Tetra Tetra
Help on  Strunz Class: Strunz Class: 02.LA.50 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.L - Unclassified Sulfosalts
  02.LA -Without essential Pb
02.LA.50 Benleonardite Ag8(Sb,As)Te2S3 Tetra Tetra

Other Benleonardite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Bull.Miner.,Vol.107-111,1984-1988) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Benleonardite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Scandinavian mineral gallery

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Dana No: Strunz No: 02.LA.50





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