Baumhauerite
A valid IMA mineral species - grandfathered
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About Baumhauerite
Formula:
Pb12As16S36
Simplified Pb3As4S9. May contain minor Sb substituting for As.
Colour:
Lead-grey, steel-grey; iridescent at times
Lustre:
Metallic
Hardness:
3
Specific Gravity:
5.33 - 5.44
Crystal System:
Triclinic
Member of:
Name:
Named in 1902 by Richard Harrison Solly in honor of Heinrich Adolf Baumhauer [October 26, 1848 Bonn, Germany - August 1, 1926 Fribourg, Switzerland], Professor of Mineralogy, University of Fribourg, Switzerland.
Type Locality:
Compare argentobaumhauerite (formerly 'baumhauerite-2a') and bernarlottiite (Sb-rich); also 'UM1966-04-S:AsPb'.
The structure contains isolated and interconnected AsS3 pyramids, as, e.g., in case of dufrénoysite, gratonite, sartorite, and seligmannite.
The structure contains isolated and interconnected AsS3 pyramids, as, e.g., in case of dufrénoysite, gratonite, sartorite, and seligmannite.
Unique Identifiers
Mindat ID:
572
Long-form identifier:
mindat:1:1:572:8
Similar Names
| Baumhauerit-2a | A synonym of Argentobaumhauerite |
| Baumhauerite II | A valid IMA mineral species - grandfathered - questionable |
IMA Classification of Baumhauerite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Pb2+12As3+16S2-36
Approval year:
1988
First published:
1902
Classification of Baumhauerite
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
3.6.13.1
3 : SULFOSALTS
6 : 2 < ø < 2.49
3 : SULFOSALTS
6 : 2 < ø < 2.49
5.6.4
5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
6 : Sulpharsenites etc. of Pb alone
5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
6 : Sulpharsenites etc. of Pb alone
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 |
|---|---|---|
| Bha | 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 Baumhauerite
Metallic
Transparency:
Opaque
Colour:
Lead-grey, steel-grey; iridescent at times
Streak:
Chocolate-brown
Hardness:
3 on Mohs scale
Hardness:
VHN100=179 - Vickers
Tenacity:
Brittle
Cleavage:
Perfect
On {100} perfect.
On {100} perfect.
Fracture:
Conchoidal
Density:
5.33 - 5.44 g/cm3 (Measured) 5.42 g/cm3 (Calculated)
Optical Data of Baumhauerite
Anisotropism:
Strong, in dark brown, pale brown, pale brownish grey, green, violet, blue-green or yellow
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 400nm | 38.0% | 42.1% |
| 420nm | 37.6% | 41.9% |
| 440nm | 37.2% | 41.6% |
| 460nm | 36.8% | 41.2% |
| 480nm | 36.4% | 40.7% |
| 500nm | 36.0% | 40.4% |
| 520nm | 35.5% | 39.8% |
| 540nm | 35.1% | 39.2% |
| 560nm | 34.6% | 38.6% |
| 580nm | 34.2% | 37.9% |
| 600nm | 33.7% | 37.2% |
| 620nm | 33.2% | 36.5% |
| 640nm | 32.5% | 35.7% |
| 660nm | 31.8% | 34.9% |
| 680nm | 31.1% | 34.2% |
| 700nm | 30.5% | 33.5% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 42.1%.
R1 shown in black, R2 shown in red
Colour in reflected light:
White
Internal Reflections:
Deep red
Chemistry of Baumhauerite
Mindat Formula:
Pb12As16S36
Simplified Pb3As4S9. May contain minor Sb substituting for As.
Simplified Pb3As4S9. May contain minor Sb substituting for As.
Element Weights:
Elements listed:
Common Impurities:
Sb
Crystallography of Baumhauerite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 22.74 Å, b = 8.33 Å, c = 7.89 Å
α = 90.35°, β = 97°, γ = 90.42°
α = 90.35°, β = 97°, γ = 90.42°
Ratio:
a:b:c = 2.73 : 1 : 0.947
Unit Cell V:
1,483.34 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Short prismatic [010]; tabular {100}; striated on {100} parallel to [010] and on {010} parallel to [001]. Some crystals considerably rounded, as by etching.
Twinning:
On {100}, polysynthetic, with visible twin lamellae.
Comment:
Pseudomonoclinic. Also a = 22.905, b = 8.329, c = 7.957 (ICDD 12-281)
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) |
|---|---|---|---|---|---|---|---|
| 0010683 | Baumhauerite | Engel P, Nowacki W (1969) Die kristallstruktur von baumhauerit Zeitschrift fur Kristallographie 129 178-202 | ![]() | 1969 | Lengenbach quarry, Binnatal, Canton Wallis, Switzerland | 0 | 293 |
| 0009265 | Baumhauerite | Le Bihan M T (1961) Contribution a l'etude structurale des sulfures d'arsenic et de plomb. Structure de la baumhauerite Acta Crystallographica 14 1210-1211 | ![]() | 1961 | Binnenthal, Switzerland | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 11.5 Å | (20) |
| 7.69 Å | (10) |
| 7.22 Å | (10) |
| 6.78 Å | (10) |
| 6.15 Å | (10) |
| 5.82 Å | (10) |
| 5.64 Å | (10) |
| 5.17 Å | (10) |
| 4.924 Å | (10) |
| 4.716 Å | (10) |
| 4.548 Å | (10) |
| 4.360 Å | (10) |
| 4.149 Å | (100) |
| 3.983 Å | (10) |
| 3.872 Å | (20) |
| 3.806 Å | (20) |
| 3.743 Å | (10) |
| 3.682 Å | (10) |
| 3.594 Å | (80) |
| 3.470 Å | (80) |
| 3.398 Å | (20) |
| 3.258 Å | (60) |
| 3.184 Å | (30) |
| 3.061 Å | (10) |
| 3.020 Å | (60) |
| 2.957 Å | (90) |
| 2.873 Å | (40) |
| 2.799 Å | (20) |
| 2.773 Å | (80) |
| 2.724 Å | (60) |
| 2.661 Å | (20) |
| 2.619 Å | (5) |
| 2.579 Å | (10) |
| 2.569 Å | (10) |
| 2.354 Å | (50) |
| 2.257 Å | (5) |
| 2.223 Å | (30) |
| 2.095 Å | (40) |
| 2.056 Å | (10) |
Comments:
ICDD 12-281. Binntal, Switzerland (close to baumhauerite-2a).
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 Baumhauerite
General Appearance of Type Material:
Isolated crystals, closely resembling dufrenoysite and jordanite.
Place of Conservation of Type Material:
British Museum of Natural History, London, England, 1926,1654.
Geological Setting of Type Material:
Dolomite
Associated Minerals at Type Locality:
Synonyms of Baumhauerite
Other Language Names for Baumhauerite
Dutch:Baumhaueriet
German:Baumhauerit
Japanese:バウムハウエル鉱
Russian:Баумгауерит
Simplified Chinese:褐硫砷铅矿
Spanish:Baumhauerita
Traditional Chinese:褐硫砷鉛礦
Relationship of Baumhauerite to other Species
Member of:
Other Members of Sartorite Group:
| Argentobaumhauerite | Ag1.5Pb22As33.5S72 | Tric. 1 : P1 |
| Argentodufrénoysite | Ag3Pb26As35S80 | Tric. 1 : P1 |
| Argentoliveingite | Ag3+xPb36-2xAs51+xS112 | Tric. 1 : P1 |
| Barikaite | Ag3Pb10(Sb8As11)S40 | Mon. 2/m : P21/b |
| 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:
| 12 photos of Baumhauerite associated with Realgar | As4S4 |
| 11 photos of Baumhauerite associated with Sphalerite | ZnS |
| 10 photos of Baumhauerite associated with Pyrite | FeS2 |
| 10 photos of Baumhauerite associated with Dolomite | CaMg(CO3)2 |
| 8 photos of Baumhauerite associated with Tennantite Subgroup | Cu6(Cu4C2+2)As4S12S |
| 4 photos of Baumhauerite associated with Argentobaumhauerite | Ag1.5Pb22As33.5S72 |
| 3 photos of Baumhauerite associated with Pararealgar | As4S4 |
| 3 photos of Baumhauerite associated with Argentoliveingite | Ag3+xPb36-2xAs51+xS112 |
| 3 photos of Baumhauerite associated with Liveingite | Pb20As24S56 |
| 3 photos of Baumhauerite associated with Calcite | CaCO3 |
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.05b | Argentobaumhauerite | Ag1.5Pb22As33.5S72 |
| 2.HC.05c | Argentoliveingite | Ag3+xPb36-2xAs51+xS112 |
| 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 |
Fluorescence of Baumhauerite
Not fluorescent in UV
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 Baumhauerite
mindat.org URL:
https://www.mindat.org/min-572.html
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References for Baumhauerite
Reference List:
Solly, R. H., Jackson, H. (1902) Sulpharsenites of Lead from the Binnenthal. Part III.—Baumhauerite, a new mineral; and Dufrenoysite. Mineralogical Magazine and Journal of the Mineralogical Society, 13 (60) 151-171 doi:10.1180/minmag.1902.13.60.04
Solly, R. H. (1903) Sulpharsenites of lead from the Binnenthal. Part IV.—Seligmannite : with a supplementary note on Baumhauerite. Mineralogical Magazine and Journal of the Mineralogical Society, 13 (62) 336-341 doi:10.1180/minmag.1903.013.62.07
Palache, Charles (1938) Crystallographic studies of the sulphosalts: baumhauerite, meneghinite, jordanite, diaphorite, freieslebenite. American Mineralogist, 23 (11) 821-836
Le Bihan, M. T. (1961) Contribution a l'étude structurale des sulfures d'arsenic et de plomb. Structure de la baumhauerite. Acta Crystallographica, 14 (11) 1210-1211 doi:10.1107/s0365110x61003533
Ramdohr, Paul (1969) The Ore Minerals and their Intergrowths. Pergamon Press, Oxford. 1174pp. doi:10.1016/c2013-0-10027-x
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
Pring, Allan, Graeser, Stefan (1994) Polytypism in baumhauerite. American Mineralogist, 79 (3-4) 302-307
Localities for Baumhauerite
Showing 20 localities.
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.
Australia | |
| Muller (1972) +1 other reference |
Austria | |
| Graeser et al. (1986) +2 other references |
| Kolitsch (2009) |
Canada | |
| Jambor (1967) +1 other reference |
| Harris et al. (1988) +1 other reference |
| Sabina (1991) | |
Iran | |
| Asadi +3 other references |
Italy | |
| Orlandi et al. (1996) +1 other reference |
Japan | |
| Koubutsu Jouhou (15-4-2002) |
Kyrgyzstan | |
| Kolesar et al. (1993) |
| Mineralogical Society of America - ... | |
Peru | |
| Vizquerra Benavides (2006) |
Romania | |
| Dincă et al. (2025) |
Switzerland (TL) | |
| Mineralogical Magazine (1902) +2 other references |
| Dan Topa | |
USA | |
| King (n.d.) |
| Eckel et al. (1997) |
| J. Cianciulli |
| Dunn (1995) | |
| Robert C. Smith II Ph.D. P.G. |
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The
Lengenbach Quarry, Fäld, Binn, Goms, Valais, Switzerland