Arsenpolybasite Mineral Data

General Arsenpolybasite Information

Chemical Formula:

[Ag9CuS4] [(Ag,Cu)6(As,Sb)2S7]

Composition:

Molecular Weight = 2,074.59 gm

Copper 12.25 % Cu

Silver 62.39 % Ag

Antimony 2.93 % Sb

Arsenic 5.42 % As

Sulfur 17.00 % S

______

100.00 %

Empirical Formula:

Ag₁₂Cu₄As_1.5Sb_0.5S₁₁

Environment:

Formed in silver-bearing hydrothermal veins of low to moderate temperature.

IMA Status:

Approved IMA 1963

Locality:

At the Neuer Morgenstern mine, Freiberg, Saxony, Germany. In Peru, at Quespisiza. From Creede, Mineral Co., Colorado, USA. Link to MinDat.org Location Data.

Name Origin:

For the chemical composition and close relationship to polybasite.

Name Pronunciation:

Arsenpolybasite + Pronunciation

Synonym:

Pearceite-M2a2b2c - Suggested nomenclature from AmMin v92:918

Pearceite-T2ac - Suggested nomenclature from AmMin v92:918

Arsenpolybasite Image

Images:

Arsenpolybasite

Comments: Back, crystalline arsenpolybasite in quartz.
Location: Medenec, Severocesky, Moravia, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Arsenpolybasite Crystallography

Axial Ratios:

a:b:c =1.734:1:1.5851

Cell Dimensions:

a = 26.08, b = 15.04, c = 23.84, Z = 16; beta = 90° V = 9,351.08 Den(Calc)= 5.89

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3(1), 3.19(0.9), 2.88(0.8),

Physical Properties of Arsenpolybasite

Cleavage:

{???} Indistinct, {001} Distinct

Color:

Black.

Density:

6.18 - 6.23, Average = 6.2

Diaphaneity:

Opaque

Fracture:

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

Hardness:

3 - Calcite

Luster:

Metallic

Streak:

black

Optical Properties of Arsenpolybasite

Optical Data:

Biaxial (-), b=2.72, 2V(Meas)=22. Dispersion very strong.

Pleochroism (y):

dark red.

RL Pleochroism:

Weak.

Calculated Properties of Arsenpolybasite

Electron Density:

Bulk Density (Electron Density)=5.29 gm/cc
note: Specific Gravity of Arsenpolybasite =5.89 gm/cc.

Fermion Index:

Fermion Index = 0.0012751678
Boson Index = 0.9987248322

Photoelectric:

PE_{Arsenpolybasite}= 178.68 barns/electron
U=PE_{Arsenpolybasite} x rElectron Density= 944.58 barns/cc.

Radioactivity:

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

Arsenpolybasite Classification

Dana Class:

03.01.07.01 (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 Arsenpolybasite Information

References:

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

See Also:

Links to other databases for Arsenpolybasite :
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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Arsenpolybasite

[Ag9CuS4] [(Ag,Cu)6(As,Sb)2S7]
Dana No: 03.01.07.01 Strunz No: 02.GB.15
Locality:

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