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Lengenbachite

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Formula:
Ag4Cu2Pb18As12S39
System:
Triclinic
Colour:
Steel-gray, iridescent ...
Lustre:
Metallic
Hardness:
1 - 2
Name:
From the type locality, the Lengenbach quarry, Binntal, Valais, Switzerland.
This page provides mineralogical data about Lengenbachite.


Classification of Lengenbachite

Approved, 'Grandfathered' (first described prior to 1959)
2.HF.30

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
F : With SnS and PbS archetype structure units
3.3.7.1

3 : SULFOSALTS
3 : 3 <ø < 4
5.7.40

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 Lengenbachite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Steel-gray, iridescent tarnish at times
Streak:
Black
Hardness (Mohs):
1 - 2
Tenacity:
Malleable
Density:
5.8 - 5.85 g/cm3 (Measured)    

Optical Data of Lengenbachite

Type:
Anisotropic
Anisotropism:
Weak

Chemical Properties of Lengenbachite

IMA Formula:
Ag4Cu2Pb18As12S39
Elements listed in formula:
Common Impurities:
Fe,Sb

Crystallography of Lengenbachite

Crystal System:
Triclinic

Type Occurrence of Lengenbachite

Relationship of Lengenbachite to other Species

2.HF.20VrbaiteHg3Tl4As8Sb2S20
2.HF.25aCylindriteFePb3Sn4Sb2S14
2.HF.25bFranckeitePb21.7Sn9.3Fe4.0Sb8.1S56.9
2.HF.25bIncaite(Pb,Ag)4Sn4FeSb2S15
2.HF.25aLévyclauditePb8Cu3Sn7(Bi,Sb)3S28
2.HF.25bPotosíitePb6Sn3FeSb3S16
2.HF.25bCoiraite(Pb,Sn2+)12.5As3Fe2+Sn54+S28
2.HF.25aAbramovitePb2SnInBiS7
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
5.7.21ArgentobaumhaueriteAg1.5Pb22As33.5S72
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
5.7.41BerryiteCu3Ag2Pb3Bi7S16
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 Lengenbachite

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 Lengenbachite

Reference List:
Solly (1904), Nature: 71: 118.

Solly (1905), Mineralogical Magazine: 14: 78.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 398.

Neues Jahrbuch für Mineralogie, Monatshefte (1968): 69-75.

Williams, T. B. & Pring, A. (1988): Structure of lengenbachite: a high-resolution transmission electron microscope study. Am. Mineral., 73, 1426-1433.

Makovicky, E., Leonardsen, E., Moëlo, Y. (1994): The crystallography of lengenbachite, a mineral with the noncommensurate layer structure. Neues Jahrbuch für Mineralogie, Abhandlungen 166, 169-191.

Internet Links for Lengenbachite

mindat.org URL:
https://www.mindat.org/min-2373.html
Please feel free to link to this page.

Localities for Lengenbachite

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.
Canada
 
  • Northwest Territories
    • Mackenzie District
      • Yellowknife
RIDLAND, G. C (1941) Mineralogy of the Negus and Con Mines, Yellowknife, Northwest Territories. Economic Geology 36, 45-70. COLEMAN, L.C. (1953) Mineralogy of the Yellowknife Bay are, N.W.T. American Mineralogist 38, 506-527.
RIDLAND, G. C (1941): Mineralogy of the Negus and Con Mines, Yellowknife, Northwest
Switzerland
 
  • Wallis (Valais)
    • Binn Valley
      • Binn
Cannon, R., Hensel, H. & Raber, T. (2008): Der Reckibach-Dolomit im Binntal, Schweiz: Mineralbestand und Neufunde. Lapis, 33 (3), 20-28; 50. (in German)
      • Fäld (Imfeld; Im Feld; Feld)
Nature (1904) 71, 118 and Mineralogical Magazine(1905) 14, 72-82 (p. 78)
Mineral and/or Locality  
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