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Lengenbachite

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Formula:
Ag4Cu2Pb18As12S39
Colour:
Steel-gray, iridescent tarnish at times
Lustre:
Metallic
Hardness:
1 - 2
Specific Gravity:
5.8 - 5.85
Crystal System:
Triclinic
Name:
From the type locality, the Lengenbach quarry, Binntal, Valais, Switzerland.
This page provides mineralogical data about Lengenbachite.


Hide all sections | Show all sections

Classification of LengenbachiteHide

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 LengenbachiteHide

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

Optical Data of LengenbachiteHide

Type:
Anisotropic
Anisotropism:
Weak

Chemical Properties of LengenbachiteHide

Formula:
Ag4Cu2Pb18As12S39
IMA Formula:
Ag4Cu2Pb18As12S39
Common Impurities:
Fe,Sb

Crystallography of LengenbachiteHide

Crystal System:
Triclinic

Type Occurrence of LengenbachiteHide

Other Language Names for LengenbachiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Jordanite21 photos of Lengenbachite associated with Jordanite on mindat.org.
Pyrite20 photos of Lengenbachite associated with Pyrite on mindat.org.
Dolomite15 photos of Lengenbachite associated with Dolomite on mindat.org.
Sphalerite10 photos of Lengenbachite associated with Sphalerite on mindat.org.
Tennantite5 photos of Lengenbachite associated with Tennantite on mindat.org.
Marcasite4 photos of Lengenbachite associated with Marcasite on mindat.org.
Realgar4 photos of Lengenbachite associated with Realgar on mindat.org.
Dufrénoysite4 photos of Lengenbachite associated with Dufrénoysite on mindat.org.
Imhofite2 photos of Lengenbachite associated with Imhofite on mindat.org.
Baumhauerite1 photo of Lengenbachite associated with Baumhauerite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.HF.20VrbaiteHg3Tl4As8Sb2S20Orth. mmm (2/m 2/m 2/m) : Cmca
2.HF.25aCylindritePb3Sn4FeSb2S14Tric. 1 : P1
2.HF.25bFranckeiteFe2+(Pb,Sn2+)6Sn4+2Sb2S14Tric. 1 : P1
2.HF.25bIncaite(Pb,Ag)4Sn4FeSb2S15Mon.
2.HF.25aLévyclauditePb8Sn7Cu3(Bi,Sb)3S28
2.HF.25bPotosíitePb6Sn3FeSb3S16Tric.
2.HF.25bCoiraite(Pb,Sn)12.5Sn5FeAs3S28Mon.
2.HF.25aAbramovitePb2SnInBiS7Tric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

5.7.1SeligmannitePbCuAsS3Orth. mmm (2/m 2/m 2/m) : Pmmn
5.7.2BournonitePbCuSbS3Orth. mm2 : Pmn21
5.7.3MeneghinitePb13CuSb7S24Orth. mmm (2/m 2/m 2/m)
5.7.4GladitePbCuBi5S9Orth. mmm (2/m 2/m 2/m)
5.7.5LindströmitePb3Cu3Bi7S15Orth. mmm (2/m 2/m 2/m)
5.7.6KrupkaitePbCuBi3S6Orth.
5.7.7HammaritePb2Cu2Bi4S9Orth.
5.7.8FriedrichitePb5Cu5Bi7S18Orth. mm2
5.7.9AikinitePbCuBiS3Orth. mmm (2/m 2/m 2/m) : Pnma
5.7.10NuffielditeCu1.4Pb2.4Bi2.4Sb0.2S7Orth.
5.7.11JaskólskiiteCuxPb2+x(Sb,Bi)2-xS5 (x ~ 0.15)Orth.
5.7.12TintinaitePb22Cu4(Sb,Bi)30S69Orth. mmm (2/m 2/m 2/m) : Pnnm
5.7.13KobellitePb22Cu4(Bi,Sb)30S69Orth. mmm (2/m 2/m 2/m) : Pnnm
5.7.14ProuditeCuPb7.5Bi9.33(S,Se)22Mon. 2/m : B2/m
5.7.15NordströmiteCuPb3Bi7(Se4S10)Mon.
5.7.16WatkinsoniteCu2PbBi4(Se,S,Te)8Mon.
5.7.17PekoitePbCuBi11(S,Se)18Orth.
5.7.18PetroviciteCu3HgPbBiSe5Orth.
5.7.19Eclarite(Cu,Fe)Pb9Bi12S28Orth. mmm (2/m 2/m 2/m) : Pnma
5.7.20MarriteAgPbAsS3Mon. 2/m : P21/b
5.7.21ArgentobaumhaueriteAg1.5Pb22As33.5S72Tric. 1 : P1
5.7.22AndoriteAgPbSb3S6Orth. mmm (2/m 2/m 2/m)
5.7.23RamdohritePb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24Mon. 2/m
5.7.24RoshchiniteAg19Pb10Sb51S96Orth.
5.7.25OurayiteAg3Pb4Bi5S13Orth.
5.7.26EskimoiteAg7Pb10Bi15S36Mon.
5.7.27FizélyiteAg5Pb14Sb21S48 Mon. 2/m
5.7.28OwyheeiteAg3+xPb10-2xSb11+xS28, -0.13 < x > +0.20Mon. 2/m : P21/b
5.7.29FreieslebeniteAgPbSbS3Mon. 2/m : P21/b
5.7.30DiaphoriteAg3Pb2Sb3S8Mon. 2/m : P21/b
5.7.31SterryiteCu(Ag,Cu)3Pb19(Sb,As)22(As-As)S56Mon. 2/m
5.7.32VikingiteAg5Pb8Bi13S30Mon. 2/m : B2/m
5.7.33ZoubekiteAgPb4Sb4S10Orth.
5.7.34SchirmeritePbAgBi3S6 - Pb3Ag1.5Bi3.5S9Orth.
5.7.36GustaviteAgPbBi3S6Orth. mmm (2/m 2/m 2/m)
5.7.37KitaibeliteAg10PbBi30S51
5.7.38TreasuriteAg7Pb6Bi15S32Mon.
5.7.39BenjaminiteAg3Bi7S12Mon. 2/m : B2/m
5.7.41BerryiteCu3Ag2Pb3Bi7S16Mon. 2/m : P21/m
5.7.42NeyiteAg2Cu6Pb25Bi26S68Mon.
5.7.43Larosite(Cu,Ag)21(Pb,Bi)2S13Orth.
5.7.44CupropavoniteCu0.9Ag0.5Pb0.6Bi2.5S5 Mon. 2/m : B2/m
5.7.45PadĕraiteCu7[(Cu,Ag)0.33Pb1.33Bi11.33]S22Mon.
5.7.46RayitePb8(Ag,Tl)2Sb8S21Mon.
5.7.47RathiteAg2Pb12-xTlx/2As18+x/2S40Mon. 2/m : P21/b
5.7.48HatchiteAgTlPbAs2S5Tric. 1 : P1

Other InformationHide

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 LengenbachiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 LengenbachiteHide

Localities for LengenbachiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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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