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|Pb is necessary for the stabilisation of the cubic structure of schapbachite.|
|Hardness:||3 - 4|
|Name:||Named in 1853 by Gustav Adolph Kenngott after the locality where it was originally thought to have existed as a species: Schapbach, Schwartzwald, Baden, Germany. First discredited in 1863 by F. Sandberger as a mixture of bismuthine, argentite, and galena. (Matildite was not named until 1883 by Antonio D'Achiardi.) The original schapbachite specimens were later re-analyzed and found to be a mixture of galena and matildite (Ramdohr, 1936). Hey (1982) reported that schapbachite (of Kenngott) was discredited by vote of the IMA. Schapbachite was re-used in 2004 by Kurt Walenta, H. J. Burnhardt, and T. Theye, although schapbachite did not occur at Schapbach. Pre-2004 reports of "schapbachite" have to be evaluated on the data provided.|
Note: many specimens originally described as "schapbachite (of Kenngott)" are in fact matildite with or without admixture of galena. Modern verification of any specimen with this designation is required.
Classification of Schapbachite
|IMA status:||Approved 1982|
|Explanation of status:||Redefined by CNMMN (1982) as the high-temperature dimorph of matildite (above 200 deg. C). Described as a natural (ambient temperature) phase by Walenta et al. (2004).|
|Strunz 8th edition ID:||2/C.16-35|
|Nickel-Strunz 10th (pending) edition ID:||2.JA.15|
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
J : Sulfosalts of PbS archetype
A : Galena derivatives with little or no Pb
|Hey's CIM Ref.:||5.2.18|
5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
2 : Sulpharsenites etc. of Ag
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Type Occurrence of Schapbachite
|Type Locality:||Silberbrünnle Mine, Haigerach valley, Gengenbach, Black Forest, Baden-Württemberg, Germany|
|Year of Discovery:||2004|
Physical Properties of Schapbachite
|Hardness (Mohs):||3 - 4|
Crystallography of Schapbachite
Optical Data of Schapbachite
Chemical Properties of Schapbachite
Pb is necessary for the stabilisation of the cubic structure of schapbachite.
|Simplified for copy/paste:||Ag0.4Pb0.2Bi0.4S|
|Essential elements:||Ag, Bi, Pb, S|
|All elements listed in formula:||Ag, Bi, Pb, S|
Relationship of Schapbachite to other Species
|Structurally related to group(s):|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Schapbachite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Schapbachite
Sandberger, F. (1863) Jahresbuch fur Mineralogie, p. 797.
Sandberger, F. (1882): Untersuch. Erzgadhge, 1, 90.
Ramdohr, P.(1936): Fortschr. Min. Krist. 20,56.
American Mineralogist (1951): 36: 436.
Acta Crystallographica (1959): 12:46.
American Mineralogist (1975): 60: 621.
Ramdohr, P. (1980), The Ore Minerals and their Intergrowths, 2nd edition: 665.
Hey, Max H. (1982): Mineralogical Magazine, 46, 513-514 [redefinition].
Walenta, K.; Bernhardt, H.-J. & Theye, T. (2004): Cubic AgBiS2 (schapbachite) from the Silberbrünnle mine near Gengenbach in the Central Black Forest, Germany. Neues Jahrbuch für Mineralogie, Monatshefte 2004, 425-432.
Moëlo, Y., Makovicky, E., Mozgova, N.N., Jambor, J.L., Cook, N., Pring, A., Paar, W., Nickel, E.H., Graeser, S., Karup-Møller, S.; Balić-Žunić, T.; Mumme, W.G., Vurro, F., Topa, D., Bindi, L., Bente, K., Shimizu, M. (2008): Sulfosalt systematics: a review. Report of the sulfosalt sub-committee of the IMA Commission on Ore Mineralogy. European Journal of Mineralogy, 20, 7-46.
Internet Links for Schapbachite
Localities for Schapbachite
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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New Locality Added: Great Trowlesworthy Tor, Plympton, Tavistock District, Devon, England, UKFrom Peter Haas, 29th Aug 2014 02:15:44