Schapbachite Mineral Data

General Schapbachite Information

Chemical Formula:

AgBiS2

Composition:

Molecular Weight = 392.22 gm

Silver 22.00 % Ag

Bismuth 43.16 % Bi

Lead 18.49 % Pb

Sulfur 16.35 % S

______

100.00 %

Empirical Formula:

Ag_0.8Pb_0.35Bi_0.81S₂

Environment:

Discredited 1989 as a mixture of matildite and galena. Revised as a mineral matching synthetic (cubic) AgBiS2 in 2004. Inclusions in quartz.

IMA Status:

Discredited IMA 1985 (Dana # Added)

Locality:

Original (discredited) locality at Schapbach, Baden. Silberbrï¿½nnle Mine, Haigerach valley, Gengenbach, Schwarzwald (Black Forest), Baden-Wï¿½rttemberg, Germany Link to MinDat.org Location Data.

Name Origin:

Named for the original (discredited) locality.

Synonym:

ICSD 42584

PDF 21-1178

Revised

Schapbachite Crystallography

Cell Dimensions:

a = 5.703, Z = 2; V = 185.49 Den(Calc)= 7.02

Crystal System:

Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m

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

By Intensity(I/I_o): 2.853(1)(200), 2.014(0.8)(220), 3.29(0.8)(111),

Physical Properties of Schapbachite

Cleavage:

None

Color:

Grayish black.

Diaphaneity:

Opaque

Fracture:

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

Habit:

Inclusions - Generally found as inclusions in other minerals.

Hardness:

2.5 - Finger Nail

Luster:

Metallic

Streak:

black

Optical Properties of Schapbachite

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Schapbachite in Air**
λ	R	∑ R(λ)
470 nm	45.19
546 nm	44.73
589 nm	44.32
650 nm	43.94

**Calculated Relative Intensity Colors of Schapbachite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	200%
R

Calculated Properties of Schapbachite

Electron Density:

Bulk Density (Electron Density)=5.93 gm/cc
note: Specific Gravity of Schapbachite =7.02 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Schapbachite=1,219.53 barns/electron
U=PE_Schapbachite x rElectron Density=7,226.14 barns/cc.

Radioactivity:

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

Schapbachite Classification

Dana Class:

03.07.19.01 (03)Sulfides - Sulfosalts

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

(03.07.19)Dana Group

03.07.19.01 Schapbachite? AgBiS2 F m3m 4/m 3 2/m

Strunz Class:

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

02.J - Sulfosalts of PbS Archetype

02.JA -Galena derivatives with little or no Pb

02.JA.15 Cuboargyrite! AgSbS F m3m 4/m 3 2/m

02.JA.15 Schapbachite! AgBiS2 F m3m 4/m 3 2/m

Other Schapbachite Information

References:

NAME( NJMM, 2004, p 425) PHYS. PROP.(NJMM, 2004, p 425) OPTIC PROP.(NJMM, 2004, p 425)

See Also:

Links to other databases for Schapbachite :
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 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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

Schapbachite

AgBiS2
Dana No: 03.07.19.01 Strunz No: 02.JA.15
Locality:

Notes:

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