Schapbachite
A valid IMA mineral species - grandfathered
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About Schapbachite
Formula:
Ag0.4Pb0.2Bi0.4S
Pb is necessary for the stabilisation of the cubic structure of schapbachite.
Colour:
Dark grey
Lustre:
Metallic
Hardness:
2½ - 4
Specific Gravity:
7.05 (Calculated)
Crystal System:
Isometric
Name:
Named in 1853 by Gustav Adolph Kenngott after the locality where it was originally thought to have existed as a species: Schapbach, Schwarzwald, Baden, Germany. First discredited in 1863 by F. Sandberger as a mixture of bismuthite, 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.
Type Locality:
Dimorph of:
Unique Identifiers
Mindat ID:
3558
Long-form identifier:
mindat:1:1:3558:9
GUID
(UUID V4):
(UUID V4):
9630d31a-bf22-4422-b210-c9f35e043185
IMA Classification of Schapbachite
Approved, 'Grandfathered' (first described prior to 1959)
IMA status notes:
Redefined by the IMA
IMA Formula:
Ag0.4Pb0.2Bi0.4S
Approval year:
1982
Classification of Schapbachite
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
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
5.2.18
5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
2 : Sulpharsenites etc. of Ag
5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
2 : Sulpharsenites etc. of Ag
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Spb | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Schapbachite
Metallic
Transparency:
Opaque
Colour:
Dark grey
Streak:
Black
Hardness:
2½ - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Density:
7.05 g/cm3 (Calculated)
Optical Data of Schapbachite
Type:
Isotropic
Reflectivity:
Wavelength | R |
---|---|
470nm | 45.19% |
546nm | 44.73% |
589nm | 44.32% |
650nm | 43.94% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 45.19%.
Chemistry of Schapbachite
Mindat Formula:
Ag0.4Pb0.2Bi0.4S
Pb is necessary for the stabilisation of the cubic structure of schapbachite.
Pb is necessary for the stabilisation of the cubic structure of schapbachite.
Elements listed:
Crystallography of Schapbachite
Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fm3m
Setting:
Fm3m
Cell Parameters:
a = 5.703 Å
Unit Cell V:
185.49 ų (Calculated from Unit Cell)
Z:
2
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0009219 | Schapbachite | Geller S, Wernick J H (1959) Ternary semiconducting compounds with sodium chloride-like structure: AgSbSe2, AgSbTe2, AgBiS2, AgBiSe2 Acta Crystallographica 12 46-54 | 1959 | synthetic | 0 | 293 | |
0009220 | Schapbachite | Geller S, Wernick J H (1959) Ternary semiconducting compounds with sodium chloride-like structure: AgSbSe2, AgSbTe2, AgBiS2, AgBiSe2 Acta Crystallographica 12 46-54 | 1959 | synthetic | 0 | 473 | |
0009221 | Schapbachite | Geller S, Wernick J H (1959) Ternary semiconducting compounds with sodium chloride-like structure: AgSbSe2, AgSbTe2, AgBiS2, AgBiSe2 Acta Crystallographica 12 46-54 | 1959 | synthetic | 0 | 516 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.290 Å | (80) |
2.853 Å | (100) |
2.014 Å | (80) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Schapbachite
General Appearance of Type Material:
Anhedral and reach about 0.3 mm in size.
Place of Conservation of Type Material:
Staatliches Museum für Naturkunde-Stuttgart, Germany.
Associated Minerals at Type Locality:
Reference:
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
Synonyms of Schapbachite
Wismuthsilber (in part)
Other Language Names for Schapbachite
German:Schapbachit
Silberwismutglanz (in part)
Silberwismutglanz (in part)
Russian:Шапбахит
Simplified Chinese:硫铅铋银矿
Spanish:Schapbachita
Relationship of Schapbachite to other Species
Structurally related to group(s):
Common Associates
Related Minerals - Strunz-mindat Grouping
2.JA. | Ferdowsiite | Ag8(Sb5As3)S16 |
2.JA. | Sangenaroite | Ag8(Sb8-xAsx)SΣ16 |
2.JA. | Luboržákite | Mn2AsSbS5 |
2.JA.05e | Benjaminite | Ag3Bi7S12 |
2.JA.05g | Borodaevite | Ag5(Bi,Pb,Fe)8(Sb,Bi)2S17 |
2.JA.05a | Cupropavonite | Cu0.9Ag0.5Pb0.6Bi2.5S5 |
2.JA.05i | Livingstonite | HgSb4S6(S2) |
2.JA.05d | Makovickyite | Cu1.12Ag0.81Pb0.27Bi5.35S9 |
2.JA.05f | Mummeite | Cu0.58Ag3.11Pb1.10Bi6.65S13 |
2.JA.05a | Pavonite | AgBi3S5 |
2.JA.05b | Grumiplucite | HgBi2S4 |
2.JA.05h | Mozgovaite | PbBi4S7 |
2.JA.05d | Cupromakovickyite | Cu4AgPb2Bi9S18 |
2.JA.05c | Kudriavite | (Cd,Pb)Bi2S4 |
2.JA.05a | Cupromakopavonite | Ag3Cu8Pb4Bi19S38 |
2.JA.05 | Dantopaite | Ag5Bi13S22 |
2.JA.10a | Cuprobismutite | Cu8AgBi13S24 |
2.JA.10c | Hodrušite | Cu8Bi12S22 |
2.JA.10e | Padĕraite | Cu7[(Cu,Ag)0.33Pb1.33Bi11.33]S22 |
2.JA.10d | Pizgrischite | (Cu,Fe)Cu14PbBi17S35 |
2.JA.10b | Kupčíkite | Cu3.4Fe0.6Bi5S10 |
2.JA.15 | Cuboargyrite | AgSbS2 |
2.JA.20 | Bohdanowiczite | AgBiSe2 |
2.JA.20 | Matildite | AgBiS2 |
2.JA.20 | Volynskite | AgBiTe2 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Schapbachite
mindat.org URL:
https://www.mindat.org/min-3558.html
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References for Schapbachite
Reference List:
Localities for Schapbachite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
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Silberbrünnle Mine, Gengenbach, Gengenbach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany