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Benleonardite Mineral Data
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General Benleonardite Information
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 Chemical Formula: |
Ag8(Sb,As)Te2S3 |
| Composition: |
Molecular Weight = 1,312.68 gm |
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Silver 65.74 % Ag |
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Antimony 4.64 % Sb |
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Tellurium 19.44 % Te |
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Arsenic 2.85 % As |
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Sulfur 7.33 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Ag8Sb0.5As0.5Te2S3 |
| IMA Status: |
Approved IMA 1986 |
| Locality: |
Moctezuma mine, Moctezuma, Sonora, Mexico. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Benjamin F. Leonard (1921-), U.S. Geologist. |
| Name Pronunciation: |
Benleonardite + Pronunciation  |
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Benleonardite Image |
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Images:
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Benleonardite
Comments: Gray-black benleonardite on hessite.
Location: Moctezuma, Sonora, Mexico.
Scale: Specimen Size 2x3 cm.
© Diederik Visser |
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Images:
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Benleonardite
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 |
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Benleonardite Crystallography
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| Axial Ratios: |
a:c = 1:1.9273 |
| Cell Dimensions: |
a = 6.603, c = 12.726, Z = 2; V = 554.85 Den(Calc)= 7.86 |
| Crystal System: |
Tetragonal Space Group: Tetra |
| X Ray Diffraction: |
By Intensity(I/Io): 2.936(1), 12.7(0.7), 2.608(0.35), |
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Physical Properties of Benleonardite
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| Color: |
Gray, Black. |
| Diaphaneity: |
Opaque |
| Habit: |
Anhedral Grains - Granular minerals without the expression of crystal shapes |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Hardness: |
3.5 - Copper Penny |
| Luster: |
Metallic |
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Optical Properties of Benleonardite
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| Optical Data: |
NCalc= 2.32 - from Gladstone-Dale relationship (KC = 0.1675) where Ncalc=Dcalc*KC+1
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| RL Anisotrophism: |
Moderate to strong, in tints of brown, blue, and gray. |
| RL Color: |
Very pale blue. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Benleonardite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
35.60 |
36.80 |
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| 420 nm |
35.70 |
36.60 |
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| 440 nm |
35.80 |
36.20 |
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| 460 nm |
35.70 |
35.60 |
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| 480 nm |
35.50 |
34.90 |
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| 500 nm |
35.10 |
34.10 |
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| 520 nm |
34.70 |
33.20 |
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| 540 nm |
34.10 |
32.20 |
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| 560 nm |
33.50 |
31.40 |
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| 580 nm |
32.90 |
30.70 |
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| 600 nm |
32.40 |
30.00 |
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| 620 nm |
32.00 |
29.50 |
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| 640 nm |
31.60 |
29.10 |
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| 660 nm |
31.40 |
28.70 |
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| 680 nm |
31.10 |
28.40 |
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| 700 nm |
30.80 |
28.10 |
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Calculated Relative Intensity Colors of Benleonardite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
270% |
290% |
| R1 |
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| R2 |
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Calculated Properties of Benleonardite
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| Electron Density: |
Bulk Density (Electron Density)=6.83 gm/cc
note: Specific Gravity of Benleonardite =7.86 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEBenleonardite = 259.44 barns/electron
U=PEBenleonardite x rElectron Density=1,770.95 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Benleonardite is Not Radioactive |
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Benleonardite Classification
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| Dana Class: |
03.01.10.01 (03)Sulfides - Sulfosalts |
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(03.01)where z/y > 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.01.10)Dana Group |
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03.01.10.01 Benleonardite Ag8(Sb,As)Te2S3 Tetra Tetra |
| Strunz Class: |
02.LA.50 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.L - Unclassified Sulfosalts |
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02.LA -Without essential Pb |
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02.LA.50 Benleonardite Ag8(Sb,As)Te2S3 Tetra Tetra |
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Other Benleonardite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Bull.Miner.,Vol.107-111,1984-1988) OPTIC PROP.(AntBidBlaNic1) |
| 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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Benleonardite
Ag8(Sb,As)Te2S3
Dana No: 03.01.10.01 Strunz No: 02.LA.50
Locality:
Notes:
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