Benleonardite Mineral Data

Benleonardite Mineral Data +

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General Benleonardite Information

Chemical Formula:

Ag8(Sb,As)Te2S3

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 %

Empirical Formula:

Ag₈Sb_0.5As_0.5Te₂S₃

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.

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Benleonardite Crystallography

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:

TetragonalSpace Group: Tetra

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.936(1), 12.7(0.7), 2.608(0.35),

Physical Properties of Benleonardite

Color:

Gray, Black.

Diaphaniety:

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

Optical Properties of Benleonardite

Optical Data:

NCalc= 2.32 - from Gladstone-Dale relationship (KC = 0.1675) where Ncalc=Dcalc*KC+1

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	∑ 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**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	270%	290%
R₁
R₂

Calculated Properties of Benleonardite

Electron Density:

r_electron=6.83 gm/cc
note: r_{Benleonardite}=7.86 gm/cc.

Fermion Index

Fermion Index = 0.01608
Boson Index = 0.98392

Photoelectric:

PE_{Benleonardite}= 259.44 barns/electron
U=PE_{Benleonardite} x r_electron=1,770.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Benleonardite is Not Radioactive

Benleonardite Classification

Dana Class:

3.1.10.1 (3)Sulfides - Sulfosalts

(3.1)where z/y > 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.1.10)Dana Group

3.1.10.1 Benleonardite Ag8(Sb,As)Te2S3 Tetra Tetra

Strunz Class:

II/B.05-70 II - Sulfides and sulphosalts

II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides, Selenides and Tellurides with predominant Copper and Silver/Gold

II/B.05 - Achantite - Empresite series

II/B.05-02 Argentite* Ag2S I m3m 4/m 3 2/m

II/B.05-10 Acanthite Ag2S P 2₁/n 2/m

II/B.05-30 Naumannite Ag2Se P 2₁2₁2₁ 2 2 2

II/B.05-35 Kurilite* (Ag,Au)2(Te,Se,S) P m3n,P 4₃n Cubic

II/B.05-40 Hessite Ag2Te P 2₁/c 2/m

II/B.05-50 Aguilarite Ag4SeS P 2₁2₁2₁ 2 2 2

II/B.05-60 Cervelleite Ag4TeS Unk Cubic

II/B.05-70 Benleonardite Ag8(Sb,As)Te2S3 Tetra Tetra

II/B.05-75 Tsnigriite Ag9SbTe3(S,Se)3 P 2/m,Pm Mono

II/B.05-80 Stutzite Ag5-xTe3,(x=0.24-0.36) P 6/mmm 6/m 2/m 2/m

II/B.05-90 Empressite AgTe Pmnb 2/m 2/m 2/m

Other Benleonardite Information

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - Scandinavian mineral gallery 13 -École des Mines de Paris

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Benleonardite

Ag8(Sb,As)Te2S3
Dana No: 3.1.10.1 Strunz No: II/B.05-70
Locality:

Notes: