Selenostephanite Mineral Data

Selenostephanite Mineral Data +

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General Selenostephanite Information

Chemical Formula:

Ag5Sb(Se,S)4

Composition:

Molecular Weight = 930.04 gm

Silver 57.99 % Ag

Antimony 13.09 % Sb

Selenium 25.47 % Se

Sulfur 3.45 % S

______

100.00 %

Empirical Formula:

Ag₅SbSe₃S

Environment:

In quartz and orthclase-quartz veins with other silver minerals.

IMA Status:

Approved IMA 1985

Locality:

Unidentified locality in central Chukhotka, Russia Link to MinDat.org Location Data.

Name Origin:

Named for the composition and similarity to stephanite.

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Selenostephanite Crystallography

Axial Ratios:

a:b:c =0.6638:1:0.7533

Cell Dimensions:

a = 7.86, b = 11.84, c = 8.92, Z = 4; V = 830.12 Den(Calc)= 7.44

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

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

By Intensity(I/I_o): 2.96(1), 2.28(0.9), 2.64(0.9),

Physical Properties of Selenostephanite

Color:

Lead gray.

Diaphaniety:

Opaque

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Metallic

Optical Properties of Selenostephanite

RL Anisotrophism:

Brownish gray to gray.

RL Color:

Grayish white with olive tint.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Selenostephanite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
420 nm	33.30	34.80
520 nm	33.60	36.00
580 nm	32.60	34.80
640 nm	31.00	33.00
700 nm	30.40	32.30

**Calculated Relative Intensity Colors of Selenostephanite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	270%	280%
R₁
R₂

Calculated Properties of Selenostephanite

Electron Density:

r_electron=6.46 gm/cc
note: r_{Selenostephanite}=7.44 gm/cc.

Fermion Index

Fermion Index = 0.01961
Boson Index = 0.98039

Photoelectric:

PE_{Selenostephanite}= 217.21 barns/electron
U=PE_{Selenostephanite} x r_electron=1,404.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Selenostephanite is Not Radioactive

Selenostephanite Classification

Dana Class:

3.2.4.2 (3)Sulfides - Sulfosalts

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

(3.2.4)Dana Group

3.2.4.1 Stephanite Ag5SbS4 C mc2₁ mm2

3.2.4.2 Selenostephanite Ag5Sb(Se,S)4 P 2₁2₁2₁ 2 2 2

Strunz Class:

II/E.06-20 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Sulfosalts with predominant Silver, x = 6.0 - 1.6

II/E.06 - Stefanite - Arcusbisite series

II/E.06-10 Stephanite Ag5SbS4 C mc2₁ mm2

II/E.06-20 Selenostephanite Ag5Sb(Se,S)4 P 2₁2₁2₁ 2 2 2

II/E.06-30 Arcubisite Ag6CuBiS4 Ortho ? Ortho

II/E.06-40 Fettelite! Ag24HgAs5S20 P 3₁2, P 3m1 or P 3m1 Trig

Other Selenostephanite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Selenostephanite :
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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Print or Cut-and-Paste your Selenostephanite Specimen Label here :

Selenostephanite

Ag5Sb(Se,S)4
Dana No: 3.2.4.2 Strunz No: II/E.06-20
Locality:

Notes: