Benavidesite Mineral Data

Benavidesite Mineral Data +

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General Benavidesite Information

Chemical Formula:

Pb4(Mn,Fe)Sb6S14

Composition:

Molecular Weight = 2,063.39 gm

Manganese 2.00 % Mn

Iron 0.68 % Fe

Antimony 35.40 % Sb

Lead 40.17 % Pb

Sulfur 21.76 % S

______

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.

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Benavidesite Crystallography

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 - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 3.45(1), 2.829(0.4), 4.1(0.3),

Physical Properties of Benavidesite

Cleavage:

None

Color:

Lead gray, Gray.

Density:

5.6

Diaphaniety:

Opaque

Habit:

Acicular - Occurs as needle-like crystals.

Hardness:

2.5 - Finger Nail

Luster:

Metallic

Streak:

brown gray

Optical Properties of Benavidesite

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	∑ R₁(λ)	∑ R₂(λ)
400 nm	42.00	40.70
420 nm	42.00	39.60
440 nm	42.00	39.30
460 nm	42.40	39.50
480 nm	43.00	39.90
500 nm	42.90	39.70
520 nm	42.70	39.50
540 nm	42.40	39.00
560 nm	42.20	38.90
580 nm	41.80	38.70
600 nm	41.30	38.30
620 nm	40.80	37.90
640 nm	40.90	37.50
660 nm	39.50	36.80
680 nm	38.70	36.10
700 nm	37.80	35.60

**Calculated Relative Intensity Colors of Benavidesite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%
R₁
R₂

Calculated Properties of Benavidesite

Electron Density:

r_electron=4.79 gm/cc
note: r_Benavidesite=5.60 gm/cc.

Fermion Index

Fermion Index = 0.09054
Boson Index = 0.90946

Photoelectric:

PE_Benavidesite= 843.95 barns/electron
U=PE_Benavidesite x r_electron=4,046.12 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Benavidesite is Not Radioactive

Benavidesite Classification

Dana Class:

3.6.7.2 (3)Sulfides - Sulfosalts

(3.6)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.6.7)Dana Group

3.6.7.1 Jamesonite Pb4FeSb6S14 P 2₁/a 2/m

3.6.7.2 Benavidesite Pb4(Mn,Fe)Sb6S14 P 2₁/a 2/m

Strunz Class:

II/E.22-20 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Complex Lead-Sulfosalts (Pb-Fe/Mn, Pb-Ag), with predominant Antimon x = 2.3 - 2.0

II/E.22 - Jamesonite - Sakharovaite series

II/E.22-10 Jamesonite Pb4FeSb6S14 P 2₁/a 2/m

II/E.22-20 Benavidesite Pb4(Mn,Fe)Sb6S14 P 2₁/a 2/m

II/E.22-30 Parajamesonite Pb4FeSb6S14 Unk Ortho

II/E.22-40 Sakharovaite (Pb,Fe)(Bi,Sb)2S4 Mono

Other Benavidesite Information

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 -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 -École des Mines de Paris

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Benavidesite

Pb4(Mn,Fe)Sb6S14
Dana No: 3.6.7.2 Strunz No: II/E.22-20
Locality:

Notes: