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Lengenbachite

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Lengenbach Quarry, Im Feld (Imfeld; Feld; Fäld), Binn Valley, Wallis (Valais), Switzerland
© Peter Haas

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Formula:
(Ag,Cu)
 
2
Pb
 
6
As
 
4
S
 
13
System:TriclinicColour:Steel-gray, iridescent ...
Hardness:1 - 2
Name:From the type locality, the Lengenbach quarry, Binntal, Valais, Switzerland.
This page provides mineralogical data about Lengenbachite.

Classification of Lengenbachite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/E.15-50
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:3.3.7.1

3 : SULFOSALTS
3 : 3 <ø < 4
Hey's CIM Ref.: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
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Type Occurrence of Lengenbachite

Type Locality:Lengenbach Quarry, Im Feld (Imfeld; Feld; Fäld), Binn Valley, Wallis (Valais), Switzerland
Year of Discovery:1904

Physical Properties of Lengenbachite

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

Crystallography of Lengenbachite

Crystal System:Triclinic

Optical Data of Lengenbachite

Type:Anisotropic
Anisotropism:Weak

Chemical Properties of Lengenbachite

Formula:
(Ag,Cu)
 
2
Pb
 
6
As
 
4
S
 
13
Essential elements:Ag, As, Pb, S
All elements listed in formula:Ag, As, Cu, Pb, S
Common Impurities:Fe,Sb

Relationship of Lengenbachite to other Species

Related Minerals - Nickel-Strunz Grouping):
2.HF.05Nuffieldite
Pb
 
2
Cu(Pb,Bi)Bi
 
2
S
 
7
2.HF.10Chabournéite
(Tl,Pb)
 
5
(Sb,As)
 
21
S
 
34
2.HF.20Vrbaite
Tl
 
4
Hg
 
3
Sb
 
2
As
 
8
S
 
20
2.HF.25Cylindrite
Pb
 
3
Sn
 
4
FeSb
 
2
S
 
14
2.HF.25Franckeite
Pb
 
5
Sn
 
3
Sb
 
2
S
 
14
2.HF.25Incaite
(Pb,Ag)
 
4
Sn
 
4
FeSb
 
2
S
 
13
2.HF.25Lévyclaudite
Pb
 
8
Sn
 
7
Cu
 
3
(Bi,Sb)
 
3
S
 
28
2.HF.25Potosíite
Pb
 
6
Sn
 
3
FeSb
 
3
S
 
16
2.HF.25Coiraite
(Pb,Sn)
 
12.5
Sn
 
5
FeAs
 
3
S
 
28
2.HF.25Abramovite
Pb
 
2
SnInBiS
 
7
2.HF.35Rouxelite
Cu
 
2
HgPb
 
23
Sb
 
27
S
 
65.5
Related Minerals - Hey's Index Grouping:
5.7.1Seligmannite
PbCuAsS
 
3
5.7.2Bournonite
PbCuSbS
 
3
5.7.3Meneghinite
Pb
 
13
CuSb
 
7
S
 
24
5.7.4Gladite
PbCuBi
 
5
S
 
9
5.7.5Lindströmite
Pb
 
3
Cu
 
3
Bi
 
7
S
 
15
5.7.6Krupkaite
PbCuBi
 
3
S
 
6
5.7.7Hammarite
Pb
 
2
Cu
 
2
Bi
 
4
S
 
9
5.7.8Friedrichite
Pb
 
5
Cu
 
5
Bi
 
7
S
 
18
5.7.9Aikinite
PbCuBiS
 
3
5.7.10Nuffieldite
Pb
 
2
Cu(Pb,Bi)Bi
 
2
S
 
7
5.7.11Jaskólskiite
Pb
 
2+x
Cu
 
x
(Sb,Bi)
 
2-x
S
 
6
 x = 0.2
5.7.12Tintinaite
Pb
 
22
Cu
 
4
(Sb,Bi)
 
30
S
 
69
5.7.13Kobellite
Pb
 
22
Cu
 
4
(Bi,Sb)
 
30
S
 
69
5.7.14Proudite
CuPb
 
7.5
Bi
 
9.33
(S,Se)
 
22
5.7.15Nordströmite
CuPb
 
3
Bi
 
7
(Se
 
4
S
 
10
)
5.7.16Watkinsonite
Cu
 
2
PbBi
 
4
(Se,S,Te)
 
8
5.7.17Pekoite
PbCuBi
 
11
(S,Se)
 
18
5.7.18Petrovicite
Cu
 
3
HgPbBiSe
 
5
5.7.19Eclarite
(Cu,Fe)Pb
 
9
Bi
 
12
S
 
28
5.7.20Marrite
AgPbAsS
 
3
5.7.21Baumhauerite-2a
Pb
 
11
Ag(As,Sb)
 
18
S
 
36
5.7.22Andorite
PbAgSb
 
3
S
 
6
5.7.23Ramdohrite
Ag
 
3
Pb
 
6
Sb
 
11
S
 
24
5.7.24Roshchinite
Ag
 
19
Pb
 
10
Sb
 
51
S
 
96
5.7.25Ourayite
Ag
 
3
Pb
 
4
Bi
 
5
S
 
13
5.7.26Eskimoite
Ag
 
7
Pb
 
10
Bi
 
15
S
 
36
5.7.27Fizélyite
Pb
 
14
Ag
 
5
Sb
 
21
S
 
48
 ?
5.7.28Owyheeite
Ag
 
2
Pb
 
5
Sb
 
6
S
 
15
5.7.29Freieslebenite
AgPbSbS
 
3
5.7.30Diaphorite
Ag
 
3
Pb
 
2
Sb
 
3
S
 
8
5.7.31Sterryite
Ag
 
2
Pb
 
10
(Sb,As)
 
12
S
 
29
5.7.32Vikingite
Ag
 
5
Pb
 
8
Bi
 
13
S
 
30
5.7.33Zoubekite
AgPb
 
4
Sb
 
4
S
 
10
5.7.34Schirmerite
AgPb
 
2
Bi
 
3
S
 
7
5.7.36Gustavite
Ag
 
3
Pb
 
5
Bi
 
11
S
 
24
5.7.37Kitaibelite
Ag
 
10
PbBi
 
30
S
 
51
5.7.38Treasurite
Ag
 
7
Pb
 
6
Bi
 
15
S
 
32
5.7.39Benjaminite
(Ag,Cu)
 
3
(Bi,Pb)
 
7
S
 
12
5.7.41Berryite
Pb
 
3
(Ag,Cu)
 
5
Bi
 
7
S
 
16
5.7.42Neyite
Pb
 
7
(Cu,Ag)
 
2
Bi
 
6
S
 
17
5.7.43Larosite
(Cu,Ag)
 
21
(Pb,Bi)
 
2
S
 
13
5.7.44Cupropavonite
AgCu
 
2
PbBi
 
5
S
 
10
5.7.45Padĕraite
Cu
 
5.9
Ag
 
1.3
Pb
 
1.6
Bi
 
11.2
S
 
22
5.7.46Rayite
Pb
 
8
(Ag,Tl)
 
2
Sb
 
8
S
 
21
5.7.47Rathite
(Pb,Tl)
 
3
As
 
5
S
 
10
5.7.48Hatchite
(PbTl)
 
2
AgAs
 
2
S
 
3

Other Names for Lengenbachite

German names:
Lengenbachit
Spanish names:
Lengenbachita

Other Information

Health Warning: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.

Neues Jahrbuch für Mineralogie, Abhandlungen (1994): 166: 169-191.

Internet Links for Lengenbachite

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    Localities for Lengenbachite

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    The 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.
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    (TL) indicates type locality. ? 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.
    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)
        • Im Feld (Imfeld; Feld; Fäld)
    		Nature (1904) 71, 118 and Min.Mag.(1905) 14, 72-82 (p. 78)
    Mineral and/or Locality
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