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Argentobaumhauerite

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Formula:
Ag1.5Pb22As33.5S72
System:
Triclinic
Colour:
Steel grey
Lustre:
Metallic
Hardness:
3
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.

The member of the sartorite group, described, as baumhauerite, by N1,2 = 3;4 = 3.5.

The name argenobaumhauerite 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.


Classification of Argentobaumhauerite

Approved
Notes:
Redefined by the IMA, Renamed by the IMA
Approval History:
Published without approval: 2015
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
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

Physical Properties of Argentobaumhauerite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Steel grey
Streak:
Reddish brown
Hardness (Mohs):
3
Hardness (Vickers):
VHN100=156 - 165
Tenacity:
Brittle
Cleavage:
Perfect
Probably on {100}
Fracture:
Conchoidal
Density:
5.31 g/cm3 (Calculated)

Optical Data of Argentobaumhauerite

Type:
Anisotropic
Anisotropism:
Moderate; brownish grey, greenish grey, very pale bluish grey, pale greenish grey.
Reflectivity:
400nmR1=38.9%R2= 41.9%
420nmR1=38.4%R2= 41.6%
440nmR1=37.8%R2= 41.3%
460nmR1=37.3%R2= 40.9%
480nmR1=36.8%R2= 40.5%
500nmR1=36.2%R2= 40.2%
520nmR1=35.6%R2= 39.6%
540nmR1=34.9%R2= 39.0%
560nmR1=34.2%R2= 38.1%
580nmR1=33.5%R2= 37.3%
600nmR1=32.8%R2= 36.4%
620nmR1=32.1%R2= 35.6%
640nmR1=31.4%R2= 34.7%
660nmR1=30.6%R2= 34.0%
680nmR1=30.1%R2= 33.3%
700nmR1=29.6%R2= 32.6%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 41.9%.
R1 shown in black, R2 shown in red

Chemical Properties of Argentobaumhauerite

IMA Formula:
Ag1.5Pb22As33.5S72
Elements listed in formula:
Analytical Data:
Quiruvilca, Peru; by electron microprobe.
Pb (44.35)
Ag (0.25)
Hg (0.3)
Tl (1.85)
As (20.15)
Sb (5.45)
S (24.55)
Total (96.90)
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)°
Ratio:
a:b:c = 0.934 : 1 : 5.244
Unit Cell Volume:
V 1488.8 ų
Morphology:
As domains intergrown with baumhauerite.
Comment:
Data from Topa & Makovicky (2016).
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.22 (80)
3.68 (60)
3.01 (100)
2.95 (70)
2.75 (90)
2.73 (70)
2.28 (90)
Comments:
Similar to that of baumhauerite.

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.
Empirical Formula:
Pb10.06Ag0.12Hg0.07(As12.65Sb2.10Tl0.43)S36.00; formula for the structure refinement material (from Lengenbach): Cu0.06Ag1.20Tl0.18Pb21.46Sb0.56As32.28S72.26
Associated Minerals at Type Locality:

Relationship of Argentobaumhauerite to other Species

Member of:
Other Members of Group:
ArgentodufrénoysiteAg3Pb26As35S80
ArgentoliveingiteAgxPb40-2xAs48+xS112
BarikaiteAg3Pb10(Sb8As11)S40
BaumhaueritePb12As16S36
BernarlottiitePb6(As5Sb3)S18
BoscardiniteTlPb4(Sb7As2)S18
Carducciite(Ag2Sb2)Pb12(As,Sb)16S40
DufrénoysitePb2As2S5
ÉcrinsiteAgTl3Pb4As11Sb9S36
EnneasartoriteTl6Pb32As70S140
GuettarditePbAsSbS4
HendekasartoriteTl2Pb48As82S172
HeptasartoriteTl7Pb22As55S108
HyršlitePb8As10Sb6S32
IncomsartoriteTl6Pb144As246S516
LiveingitePb9As13S28
ParapierrotiteTlSb5S8
PhilrothiteTlAs3S5
PierrotiteTl2(Sb,As)10S16
PolloneiteAgPb46As26Sb23S120
RathiteAg2Pb12-xTlx/2As18+x/2S40
SartoritePbAs2S4
Twinnite Pb0.8Tl0.1Sb1.3As0.8S4
VeenitePb2(Sb,As)2S5
2.HC.05bBaumhaueritePb12As16S36
2.HC.05eChabournéiteTl4Pb2(Sb,As)20S34
2.HC.05dDufrénoysitePb2As2S5
2.HC.05aGuettarditePbSbAsS4
2.HC.05cLiveingitePb18.5As25S56
2.HC.05fParapierrotiteTlSb5S8
2.HC.05fPierrotiteTlSb3As2S8
2.HC.05dRathiteAg2Pb12-xTlx/2As18+x/2S40
2.HC.05aSartoritePbAs2S4
2.HC.05aTwinnitePbSb2S4
2.HC.05dVeenitePb2(Sb,As)2S5
2.HC.05gMarumoitePb8As10S23
2.HC.05eDalnegroiteTl4Pb2(As,Sb)20S34
2.HC.10aFülöppitePb3Sb8S15
2.HC.10cHeteromorphitePb7Sb8S19
2.HC.10bPlagionitePb5Sb8S17
2.HC.10dRayite(Ag,Tl)2Pb8Sb8S21
2.HC.10dSemseyitePb9Sb8S21
2.HC.15BoulangeritePb5Sb4S11
2.HC.15FalkmanitePb3Sb2S6
2.HC.20RobinsonitePb4Sb6S13
2.HC.25MoëloitePb6Sb6S17
2.HC.30DadsonitePb23Sb25S60Cl
2.HC.35OwyheeiteAg3Pb10Sb11S28
2.HC.35ZoubekiteAgPb4Sb4S10
2.HC.40ParasterryiteAg4Pb20Sb14As10S58
5.7.1SeligmanniteCuPbAsS3
5.7.2BournoniteCuPbSbS3
5.7.3MeneghinitePb13CuSb7S24
5.7.4GladiteCuPbBi5S9
5.7.5LindströmitePb3Cu3Bi7S15
5.7.6KrupkaitePbCuBi3S6
5.7.7HammariteCu2Pb2Bi4S9
5.7.8FriedrichiteCu5Pb5Bi7S18
5.7.9AikiniteCuPbBiS3
5.7.10NuffielditeCu1.4Pb2.4Bi2.4Sb0.2S7
5.7.11JaskólskiiteCuxPb2+x(Sb,Bi)2-xS5 (x~0.2)
5.7.12TintinaitePb10Cu2Sb16S35
5.7.13KobellitePb11(Cu,Fe)2(Bi,Sb)15S35
5.7.14ProuditePb8Bi10S23
5.7.15NordströmitePb3CuBi7S14
5.7.16WatkinsonitePbCu2Bi4Se8
5.7.17PekoiteCuPbBi11S18
5.7.18PetroviciteCu3HgPbBiSe5
5.7.19Eclarite(Cu,Fe)Pb9Bi12S28
5.7.20MarriteAgPbAsS3
5.7.22AndoriteAgPbSb3S6
5.7.23RamdohriteCdAg5.5Pb12Sb21.5S48
5.7.24Roshchinite(Ag,Cu)19Pb10Sb51S96
5.7.25OurayiteAg3Pb4Bi5S13
5.7.26EskimoiteAg7Pb10Bi15S36
5.7.27FizélyiteAg5Pb14Sb21S48
5.7.28OwyheeiteAg3Pb10Sb11S28
5.7.29FreieslebeniteAgPbSbS3
5.7.30DiaphoriteAg3Pb2Sb3S8
5.7.31Sterryite(Ag,Cu)2Pb10(Sb,As)12S29
5.7.32VikingiteAg5Pb8Bi13S30
5.7.33ZoubekiteAgPb4Sb4S10
5.7.34SchirmeritePbAgBi3S6 - Pb3Ag1.5Bi3.5S9
5.7.36GustaviteAgPbBi3S6
5.7.37KitaibeliteAg10PbBi30S51
5.7.38TreasuriteAg7Pb6Bi15S30
5.7.39BenjaminiteAg3Bi7S12
5.7.40LengenbachiteAg4Cu2Pb18As12S39
5.7.41BerryiteCu3Ag2Pb3Bi7S16
5.7.42NeyiteAg2Cu6Pb25Bi26S68
5.7.43Larosite(Cu,Ag)21PbBiS13
5.7.44CupropavoniteCu0.9Ag0.5Pb0.6Bi2.5S5
5.7.45PadĕraiteCu7(Cu,Ag)0.33Pb1.33Bi11.33S22
5.7.46Rayite(Ag,Tl)2Pb8Sb8S21
5.7.47RathiteAg2Pb12-xTlx/2As18+x/2S40
5.7.48HatchiteAgPbTlAs2S5

Other Names for Argentobaumhauerite

Name in Other Languages:

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.

References for Argentobaumhauerite

Reference List:
Robinson, G. and Harris, D. (1987): A baumhauerite-like mineral from Quiruvilca, Peru. Mineralogical Record, 18, 199–201.

Laroussi, A., Moëlo, Y., Ohnenstetter, D., Ginderow, D. (1989): Argent et thallium dans les sulfosels de la série de la sartorite (Gisement de Lengenbach, vallée de Binn, Suisse). Comptes Rendus de l'Académie des Sciences, Série II, 308, 927-933. [as "Ag-rich baumhauerite"]

Pring, A., Birch, W. D., Sewell, D., Graeser, S., Edenharter, A. & Criddle, A. (1990): Baumhauerite-2a: A silver-bearing mineral with baumhauerite-like supercell from Lengenbach, Switzerland. American Mineralogist: 75, 915-922.

Pring, A. & Graeser, S. (1994): Polytypism in baumhauerite. American Mineralogist 79, 302-307.

Topa, D. & Makovicky, E. (2016): Argentobaumhauerite: name, chemistry, crystal structure, comparison with baumhauerite, and position in the Lengenbach mineralization sequence. Mineralogical Magazine, 80, 819-840.

Internet Links for Argentobaumhauerite

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Localities for Argentobaumhauerite

This 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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Peru
 
  • La Libertad Department
    • Santiago de Chuco Province
      • Quiruvilca District
Min.Rec. 28, #4 (1997)
Switzerland (TL)
 
  • Wallis (Valais)
    • Binn Valley
      • Fäld (Imfeld; Im Feld; Feld)
Laroussi, A., Moëlo, Y., Ohnenstetter, D., Ginderow, D. (1989): Argent et thallium dans les sulfosels de la série de la sartorite (Gisement de Lengenbach, vallée de Binn, Suisse). Comptes Rendus de l'Académie des Sciences, Série II, 308, 927-933. [as "Ag-rich baumhauerite"]; Pring, A., Birch, W. D., Sewell, D., Graeser, S., Edenharter, A. & Criddle, A. (1990): Baumhauerite-2a: A silver-bearing mineral with baumhauerite-like supercell from Lengenbach, Switzerland. American Mineralogist: 75, 915-922 [as "baumhauerite-2a"]; Topa, D. & Makovicky, E. (2016): Argentobaumhauerite: name, chemistry, crystal structure, comparison with baumhauerite, and position in the Lengenbach mineralization sequence. Mineralogical Magazine, 80, 819-840; Raber, T. (2016): Argentobaumhauerit. Schweizer Strahler 50 (3), 20-29.
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