Argentobaumhauerite
A valid IMA mineral species
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About Argentobaumhauerite
Formula:
Ag1.5Pb22As33.5S72
Colour:
Steel grey
Lustre:
Metallic
Hardness:
3
Specific Gravity:
5.31 (Calculated)
Crystal System:
Triclinic
Member of:
Name:
Originally named Baumhauerite-2a for its similarity to baumhauerite with double length of "a" cell parameter. Renamed by IMA (IMA 15-F) as argentobaumhauerite.
Type Locality:
The member of the sartorite group, described, as baumhauerite, by N1,2 = 3;4 = 3.5.
The name argentobaumhauerite replaces the former "baumhauerite-2a" which was formerly thought to be a mineral similar to baumhauerite but with a doubled length of the a cell parameter. There is Ag+As and Tl+As substitution for 2 Pb (Lengenbach material, used for structure refinement).
The structure is similar to that of baumhauerite, and consists of As-rich slabs and zigzag layers with Pb in trigonal prismatic coordination. Beside typical N=3 and N=4 baumhauerite slabs there are two distinct N=4 slabs: (1) with internal Pb and (2) with internal Ag+As instead of Pb.
The name argentobaumhauerite replaces the former "baumhauerite-2a" which was formerly thought to be a mineral similar to baumhauerite but with a doubled length of the a cell parameter. There is Ag+As and Tl+As substitution for 2 Pb (Lengenbach material, used for structure refinement).
The structure is similar to that of baumhauerite, and consists of As-rich slabs and zigzag layers with Pb in trigonal prismatic coordination. Beside typical N=3 and N=4 baumhauerite slabs there are two distinct N=4 slabs: (1) with internal Pb and (2) with internal Ag+As instead of Pb.
Unique Identifiers
Mindat ID:
571
Long-form identifier:
mindat:1:1:571:9
IMA Classification of Argentobaumhauerite
Approved
IMA status notes:
Redefined by the IMA, Renamed by the IMA
IMA Formula:
Ag1.5Pb22As33.5S72
Approval year:
1988
Approval history:
Published without approval: 2015
Classification of Argentobaumhauerite
2.HC.05b
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
C : With only Pb
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
C : With only Pb
5.7.21
5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
7 : Sulpharsenites etc. of Pb and other metals
5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
7 : Sulpharsenites etc. of Pb and other metals
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 for Standard |
|---|---|---|
| Abha | 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 Argentobaumhauerite
Metallic
Transparency:
Opaque
Colour:
Steel grey
Streak:
Reddish brown
Hardness:
3 on Mohs scale
Hardness:
VHN100=156 - 165 - Vickers
Tenacity:
Brittle
Cleavage:
Perfect
Probably on {100}
Probably on {100}
Fracture:
Conchoidal
Density:
5.31 g/cm3 (Calculated)
Optical Data of Argentobaumhauerite
Anisotropism:
Moderate; brownish grey, greenish grey, very pale bluish grey, pale greenish grey.
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 400nm | 38.9% | 41.9% |
| 420nm | 38.4% | 41.6% |
| 440nm | 37.8% | 41.3% |
| 460nm | 37.3% | 40.9% |
| 480nm | 36.8% | 40.5% |
| 500nm | 36.2% | 40.2% |
| 520nm | 35.6% | 39.6% |
| 540nm | 34.9% | 39.0% |
| 560nm | 34.2% | 38.1% |
| 580nm | 33.5% | 37.3% |
| 600nm | 32.8% | 36.4% |
| 620nm | 32.1% | 35.6% |
| 640nm | 31.4% | 34.7% |
| 660nm | 30.6% | 34.0% |
| 680nm | 30.1% | 33.3% |
| 700nm | 29.6% | 32.6% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 41.9%.
R1 shown in black, R2 shown in red
Chemistry of Argentobaumhauerite
Mindat Formula:
Ag1.5Pb22As33.5S72
Element Weights:
Elements listed:
Common Impurities:
Tl
Crystallography of Argentobaumhauerite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.9053(10) Å, b = 8.4680(10) Å, c = 44.4102(53) Å
α = 84.614(2)°, β = 86.469(2)°, γ = 90.082(8)°
α = 84.614(2)°, β = 86.469(2)°, γ = 90.082(8)°
Ratio:
a:b:c = 0.934 : 1 : 5.244
Unit Cell V:
1488.8 ų
Morphology:
As domains intergrown with baumhauerite.
Comment:
Data from Topa & Makovicky (2016).
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.22 Å | (80) |
| 3.68 Å | (60) |
| 3.01 Å | (100) |
| 2.95 Å | (70) |
| 2.75 Å | (90) |
| 2.73 Å | (70) |
| 2.28 Å | (90) |
Comments:
Similar to that of baumhauerite.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Argentobaumhauerite
Place of Conservation of Type Material:
Museum of Victoria, Melbourne, M30980, South Australian Museum, Adelaide, Australia, G15547; The Natural History Museum, London, England, 1926,1654; Natural History Museum, Basel, Switzerland, L7228.
Geological Setting of Type Material:
In sugary dolomite.
Associated Minerals at Type Locality:
Synonyms of Argentobaumhauerite
Other Language Names for Argentobaumhauerite
Relationship of Argentobaumhauerite to other Species
Member of:
Other Members of Sartorite Group:
| Argentodufrénoysite | Ag3Pb26As35S80 | Tric. 1 : P1 |
| Argentoliveingite | Ag3+xPb36-2xAs51+xS112 | Tric. 1 : P1 |
| Barikaite | Ag3Pb10(Sb8As11)S40 | Mon. 2/m : P21/b |
| Baumhauerite | Pb12As16S36 | Tric. 1 : P1 |
| Bernarlottiite | Pb6(As5Sb3)S18 | Tric. 1 : P1 |
| Boscardinite | TlPb4(Sb7As2)S18 | Tric. 1 : P1 |
| Carducciite | (Ag2Sb2)Pb12(As,Sb)16S40 | Mon. 2/m : P21/b |
| Dekatriasartorite | TlPb58As97S204 | Mon. 2/m : P21/b |
| Dufrénoysite | Pb2As2S5 | Mon. 2 : P21 |
| Écrinsite | AgTl3Pb4As11Sb9S36 | Tric. 1 : P1 |
| Enneasartorite | Tl6Pb32As70S140 | Mon. 2/m : P21/b |
| Geuerite | Ag2Tl4Pb4As22S40 | Mon. 2/m : P21/b |
| Giuşcăite | Ag2Tl4Pb4As20Sb2S40 | Mon. m |
| Guettardite | Pb8(Sb0.56As0.44)16S32 | Mon. 2/m : P21/b |
| Hendekasartorite | Tl2Pb48As82S172 | Mon. 2/m : P21/b |
| Heptasartorite | Tl7Pb22As55S108 | Mon. 2/m : P21/b |
| Hyršlite | Pb8As10Sb6S32 | Mon. 2 : P21 |
| Incomsartorite | Tl6Pb144As246S516 | Mon. 2/m |
| Interliveingite | AgPb18As25S56 | Mon. 2 : P21 |
| Liveingite | Pb20As24S56 | Mon. 2 : P21 |
| Parapierrotite | TlSb5S8 | Mon. m |
| Philrothite | TlAs3S5 | Mon. 2/m : P21/b |
| Pierrotite | Tl2(Sb,As)10S16 | Orth. mm2 : Pna21 |
| Polloneite | AgPb46As26Sb23S120 | Mon. 2 : P21 |
| Rathite | Ag2Pb12-xTlx/2As18+x/2S40 | Mon. 2/m : P21/b |
| Sartorite | PbAs2S4 | Mon. 2/m : P21/m |
| Twinnite | Pb0.8Tl0.1Sb1.3As0.8S4 | Mon. 2/m |
| Veenite | Pb16Sb9-xAs7+xS40, x ~ 0-0.5 | Mon. 2 : P21 |
Common Associates
Associations Based on Photo Data:
| 17 photos of Argentobaumhauerite associated with Hutchinsonite | TlPbAs5S9 |
| 14 photos of Argentobaumhauerite associated with Orpiment | As2S3 |
| 5 photos of Argentobaumhauerite associated with Baryte | BaSO4 |
| 4 photos of Argentobaumhauerite associated with Baumhauerite | Pb12As16S36 |
| 4 photos of Argentobaumhauerite associated with Argentoliveingite | Ag3+xPb36-2xAs51+xS112 |
| 3 photos of Argentobaumhauerite associated with Enargite | Cu3AsS4 |
| 2 photos of Argentobaumhauerite associated with Interliveingite | AgPb18As25S56 |
| 2 photos of Argentobaumhauerite associated with Hendekasartorite | Tl2Pb48As82S172 |
| 2 photos of Argentobaumhauerite associated with Rathite | Ag2Pb12-xTlx/2As18+x/2S40 |
| 2 photos of Argentobaumhauerite associated with Liveingite | Pb20As24S56 |
Related Minerals - Strunz-mindat Grouping
| 2.HC. | Bernarlottiite | Pb6(As5Sb3)S18 |
| 2.HC. | Huntingdonite | Pb19Sb16As6S51Cl2 |
| 2.HC. | Moiraite | Pb12Sb8As8S36 |
| 2.HC.05f | Parapierrotite | TlSb5S8 |
| 2.HC.05g | Marumoite | Pb32As40S92 |
| 2.HC.05b | Baumhauerite II | |
| 2.HC.05d | Rathite | Ag2Pb12-xTlx/2As18+x/2S40 |
| 2.HC.05e | Heptasartorite | Tl7Pb22As55S108 |
| 2.HC.05d | Dufrénoysite | Pb2As2S5 |
| 2.HC.05e | Hendekasartorite | Tl2Pb48As82S172 |
| 2.HC.05c | Argentoliveingite | Ag3+xPb36-2xAs51+xS112 |
| 2.HC.05b | Baumhauerite | Pb12As16S36 |
| 2.HC.05d | Veenite | Pb16Sb9-xAs7+xS40, x ~ 0-0.5 |
| 2.HC.05e | Dekatriasartorite | TlPb58As97S204 |
| 2.HC.05a | Hyršlite | Pb8As10Sb6S32 |
| 2.HC.05e | Incomsartorite | Tl6Pb144As246S516 |
| 2.HC.05c | Liveingite | Pb20As24S56 |
| 2.HC.05c | Johnjamborite | Pb14Sb8.5As7.5S38 |
| 2.HC.05f | Pierrotite | Tl2(Sb,As)10S16 |
| 2.HC.05d | Rathite-IV | PbAs2S4 |
| 2.HC.05d | Argentodufrénoysite | Ag3Pb26As35S80 |
| 2.HC.05e | Écrinsite | AgTl3Pb4As11Sb9S36 |
| 2.HC.05a | Sartorite | PbAs2S4 |
| 2.HC.05a | Twinnite | Pb0.8Tl0.1Sb1.3As0.8S4 |
| 2.HC.05f | Philrothite | TlAs3S5 |
| 2.HC.05h | Polloneite | AgPb46As26Sb23S120 |
| 2.HC.05a | Guettardite | Pb8(Sb0.56As0.44)16S32 |
| 2.HC.10a | Fülöppite | Pb3Sb8S15 |
| 2.HC.10d | Semseyite | Pb9Sb8S21 |
| 2.HC.10d | Rayite | Pb8(Ag,Tl)2Sb8S21 |
| 2.HC.10c | Heteromorphite | Pb7Sb8S19 |
| 2.HC.10b | Plagionite | Pb5Sb8S17 |
| 2.HC.15 | Falkmanite | Pb3Sb2S6 |
| 2.HC.15 | Boulangerite | Pb5Sb4S11 |
| 2.HC.20 | Robinsonite | Pb4Sb6S13 |
| 2.HC.25 | Moëloite | Pb6Sb6S14(S3) |
| 2.HC.30 | Dadsonite | Pb23Sb25S60Cl |
| 2.HC.35 | Zoubekite | AgPb4Sb4S10 |
| 2.HC.35 | Proto-owyheeite | Ag9Pb40Sb45S112 |
| 2.HC.35 | Owyheeite | Ag3Pb10Sb11S28 |
| 2.HC.40 | Parasterryite | Ag4Pb20Sb14As10S58 |
| 2.HC.50 | Lopatkaite | Pb5Sb3AsS11 |
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 Argentobaumhauerite
mindat.org URL:
https://www.mindat.org/min-571.html
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References for Argentobaumhauerite
Reference List:
Pring, Allan, Birch, William D., Sewell, David, Graeser, Stefan, Edenharter, Andreas, Criddle, Alan (1990) Baumhauerite-2a: A silver-bearing mineral with a baumhauerite-like supercell from Lengenbach, Switzerland. American Mineralogist, 75 (7-8) 915-922
Localities for Argentobaumhauerite
Showing 2 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Peru | |
| Harris et al. (1987) +1 other reference |
Switzerland (TL) | |
| Laroussi et al. (1989) +3 other references |
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Lengenbach Quarry, Fäld, Binn, Goms, Valais, Switzerland