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Benavidesite Mineral Data
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General Benavidesite Information
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 Chemical Formula: |
Pb4(Mn,Fe)Sb6S14 |
| Composition: |
Molecular Weight = 2,063.39 gm |
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Manganese 2.00 % Mn |
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Iron 0.68 % Fe |
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Antimony 35.40 % Sb |
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Lead 40.17 % Pb |
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Sulfur 21.76 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Pb4Mn2+0.75Fe2+0.25Sb6S14 |
| Environment: |
Metamorphosed iron sulfide deposit associated with submarine felsic volcanism. |
| IMA Status: |
Approved IMA 1982 |
| Locality: |
Satra mine, Dovertorp, Bergslagen, Sweden. Link to MinDat.org Location Data. |
| Name Origin: |
Named for A. Benavides to honor his contributions in the development of mining in Peru. |
| Name Pronunciation: |
Benavidesite + Pronunciation  |
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Benavidesite Image |
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Images:
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Benavidesite
Comments: Gray tabular benavidesite crystals associated with quartz.
Location: Bear Basin Mines, Bear Basin, North Bend, King County, Washington, USA.
Scale: See Image.
© Rruff Database |
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Benavidesite Crystallography
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| Axial Ratios: |
a:b:c =0.8223:1:0.2121 |
| Cell Dimensions: |
a = 15.74, b = 19.14, c = 4.06, Z = 2; beta = 91.5° V = 1,222.71 Den(Calc)= 5.60 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a |
| X Ray Diffraction: |
By Intensity(I/Io): 3.45(1), 2.829(0.4), 4.1(0.3), |
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Physical Properties of Benavidesite
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| Cleavage: |
None |
| Color: |
Lead gray, Gray. |
| Density: |
5.6 |
| Diaphaneity: |
Opaque |
| Habit: |
Acicular - Occurs as needle-like crystals. |
| Hardness: |
2.5 - Finger Nail |
| Luster: |
Metallic |
| Streak: |
brown gray |
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Optical Properties of Benavidesite
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| RL Anisotrophism: |
Strong with tints of brown and blue. |
| RL Color: |
White with a greenish tint with rare dull red internal reflections.. |
| RL Pleochroism: |
Weak. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Benavidesite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
42.00 |
40.70 |
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| 420 nm |
42.00 |
39.60 |
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| 440 nm |
42.00 |
39.30 |
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| 460 nm |
42.40 |
39.50 |
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| 480 nm |
43.00 |
39.90 |
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| 500 nm |
42.90 |
39.70 |
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| 520 nm |
42.70 |
39.50 |
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| 540 nm |
42.40 |
39.00 |
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| 560 nm |
42.20 |
38.90 |
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| 580 nm |
41.80 |
38.70 |
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| 600 nm |
41.30 |
38.30 |
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| 620 nm |
40.80 |
37.90 |
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| 640 nm |
40.90 |
37.50 |
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| 660 nm |
39.50 |
36.80 |
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| 680 nm |
38.70 |
36.10 |
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| 700 nm |
37.80 |
35.60 |
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Calculated Relative Intensity Colors of Benavidesite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
| R1 |
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| R2 |
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Calculated Properties of Benavidesite
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| Electron Density: |
Bulk Density (Electron Density)=4.79 gm/cc
note: Specific Gravity of Benavidesite =5.60 gm/cc.
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| Fermion Index: |
Fermion Index = 0.09
Boson Index = 0.91 |
| Photoelectric: |
PEBenavidesite = 843.95 barns/electron
U=PEBenavidesite x rElectron Density=4,046.12 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Benavidesite is Not Radioactive |
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Benavidesite Classification
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| Dana Class: |
03.06.07.02 (03)Sulfides - Sulfosalts |
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(03.06)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.06.07)Dana Group |
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03.06.07.01 Jamesonite Pb4FeSb6S14 P 21/a 2/m |
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03.06.07.02 Benavidesite Pb4(Mn,Fe)Sb6S14 P 21/a 2/m |
| Strunz Class: |
02.HB.15 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.H - Sulfosalts of SnS Archetype |
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02.HB -With Cu, Ag, Hg, Fe, Sn and Pb |
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02.HB.15 Benavidesite Pb4(Mn,Fe)Sb6S14 P 21/a 2/m |
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02.HB.15 Jamesonite Pb4FeSb6S14 P 21/a 2/m |
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Other Benavidesite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Benavidesite :
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
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Benavidesite
Pb4(Mn,Fe)Sb6S14
Dana No: 03.06.07.02 Strunz No: 02.HB.15
Locality:
Notes:
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