Selenopolybasite Mineral Data

[Newest Minerals] [Mineral Auctions] [Mineral Gallery]
The Mineral Gallery's Exceptional Specimens and Mineral Hall of Fame
Visa, PayPal, and Mastercard are Welcomed

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

Search for Selenopolybasite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

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 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Selenopolybasite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Selenopolybasite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Selenopolybasite Mineral Data :

Ask about Selenopolybasite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: