Selenopolybasite Mineral Data

General Selenopolybasite Information

Chemical Formula:

[(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2]

Composition:

Molecular Weight = 2,378.81 gm

Zinc 0.03 % Zn

Iron 0.07 % Fe

Copper 3.21 % Cu

Silver 66.52 % Ag

Bismuth 0.09 % Bi

Antimony 9.52 % Sb

Arsenic 0.60 % As

Lead 0.09 % Pb

Selenium 8.46 % Se

Sulfur 11.42 % S

______

100.00 %

Empirical Formula:

Ag_5.67Cu_0.2Bi_0.01Pb_0.01Zn_0.01Fe²⁺_0.03Sb_1.86As_0.19S_6.68Se_0.34Ag₉CuS_1.79Se_0.21Se₂

Environment:

Pearceite-polybasite group

IMA Status:

Approved IMA 2006 (Dana # Added)

Locality:

De Lamar mine, Owyhee County, Idaho, U.S.A. Link to MinDat.org Location Data.

Name Origin:

Named as the selenium dominant analogue of polybasite.

Synonym:

IMA2006-053

Selenopolybasite-Tac

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Selenopolybasite Crystallography

Axial Ratios:

a:c = 1:1.58961

Cell Dimensions:

a = 7.595, c = 12.0731, Z = 1; V = 603.12 Den(Calc)= 6.55

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: P 3m1

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

By Intensity(I/I_o): 2.888(1), 3.0183(0.84), 2.888(0.48),3.1731(0.48), 2.3629(0.34), 1.8987(0.31), 2.2237(0.28), 2.5466(0.23),

Physical Properties of Selenopolybasite

Cleavage:

None

Color:

Black.

Diaphaneity:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

3-3.5 - Calcite-Copper Penny

Luster:

Metallic

Streak:

black

Optical Properties of Selenopolybasite

Optical Data:

NCalc= 1.84 - from Gladstone-Dale relationship (KC = 0.129) where Ncalc=Dcalc*KC+1

RL Bireflectance:

Weak to moderate.

RL Color:

Light gray.

RL Pleochroism:

Weakly gray to violet blue gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Selenopolybasite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	29.30	34.10
547 nm	30.20	32.90
580 nm	31.00	31.80
650 nm	32.80	30.00

**Calculated Relative Intensity Colors of Selenopolybasite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	300%
R₁
R₂

Calculated Properties of Selenopolybasite

Electron Density:

Bulk Density (Electron Density)=5.78 gm/cc
note: Specific Gravity of Selenopolybasite =6.55 gm/cc.

Fermion Index:

Fermion Index = 0.0075078228
Boson Index = 0.9924921772

Photoelectric:

PE_{Selenopolybasite}= 215.89 barns/electron
U=PE_{Selenopolybasite} x rElectron Density=1,248.80 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Selenopolybasite is Not Radioactive

Selenopolybasite Classification

Dana Class:

03.01.07.03 (03)Sulfides - Sulfosalts

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

(03.01.07)Polybasite group

03.01.07.01 Arsenpolybasite [Ag9CuS4][(Ag,Cu)6(As,Sb)2S7] C 2/m 2/m

03.01.07.02 Polybasite [Ag9CuS4][(Ag,Cu)6(Sb,As)2S7] C 2/m 2/m

03.01.07.03 Selenopolybasite! [(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2] P 3m1 3m

03.01.07.04 Cupropolybasite! [Cu6Sb2S7][Ag9CuS4] P 3m1 3 2/m

Strunz Class:

02.GB.15 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.G - Sulfarsenites, sulfantimonites, sulfbismuthites

02.GB -Neso-sulfarsenites, etc

02.GB.15 Antimonpearceite [Ag9CuS4][(Ag,Cu)6(Sb,As)2S7] C 2/m 2/m

02.GB.15 Arsenpolybasite [Ag9CuS4][(Ag,Cu)6(As,Sb)2S7] C 2/m 2/m

02.GB.15 Polybasite [Ag9CuS4][(Ag,Cu)6(Sb,As)2S7] C 2/m 2/m

02.GB.15 Pearceite [Ag9CuS4][(Ag,Cu)6(As,Sb)2S7] P 3m1 3 2/m

02.GB.15 Cupropearceite [Cu6As2S7][Ag9CuS4] P 3m1 3 2/m

02.GB.15 Selenopolybasite! [(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2] P 3m1 3m

02.GB.15 Cupropolybasite! [Cu6Sb2S7][Ag9CuS4] P 3m1 3 2/m

Other Selenopolybasite Information

References:

NAME( AmMin, v93:1689) PHYS. PROP.(AmMin, v93:1689) OPTIC PROP.(AmMin, v93:1689)

See Also:

Links to other databases for Selenopolybasite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Selenopolybasite Specimen Label here :

Selenopolybasite

[(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2]
Dana No: 03.01.07.03 Strunz No: 02.GB.15
Locality:

Notes: