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

World famous metamorphosed sulphosalt/sulphide deposit in sugary dolomite. Mined for specimens (for current situation see website below). Located about 1 km southeast of Im Feld.

References:
- Guisca (1930) Schweiz. min. Mitt.: 10: 152
- Bader (1934), Schweiz. min. Mitt.: 14: 319.
- Niggli, Koenigsberger, and Parker (1940): 1: 251.
- Rocks & Minerals: 64: 9.
- Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 834.
- Graeser, St. (1965): Die Mineralfunde im Dolomit des Binnatales. - Schweiz. Miner. Petrogr. Mitt., 45, 597-795.
- Mineralogical Record (1977): 8(4): 272-286.
- Preite, D., Tabacchi C. (1989): I minerali di Lengenbach in Valle di Binn (CH). Rivista Mineralogica Italiana, 12(3), 139-150.
- Graeser, S., Schwander, H., Wulf, R., Edenharter, A. (1992). Erniggliite (Tl2 SnAs2 S6), a new mineral from Lengenbach, Binntal (Switzerland): description and crystal structure determination based on data from synchrotron radiation. Schweiz. Mineral. Petrogr. Mitt., 72: 293-305.
- Hofmann, B. A. (1994): Formation of a sulfide melt during Alpine metamorphism of the Lengenbach polymetallic sulfide mineralization, Binntal, Switzerland. - Mineral. Deposita, 29, 439-42.
- Hofmann, B. A. & Knill, M. D. (1996): Geochemistry and genesis of the Lengenbach Pb-Zn-As-Tl-Ba-mineralisation, Binn Valley, Switzerland. Mineral. Deposita, 31, 319-39.
- HOFMANN, B. & KNILL, M. D. (1996): Neue Erkenntnisse über die Entstehung der Minerallagerstätte Lengenbach im Binntal (VS). - Schweizer Strahler 11 (XXXI) (2), 68-77.
- KNILL, M. (1996): The Pb-Zn-As-Tl-Ba-deposit at Lengenbach, Binn Valley, Switzerland. - Beiträge zur Geologie der Schweiz, Geotechnische Serie 90; Hrsg.: Schweizerische Geotechnische Kommission, 74 pp.
- Lapis (2004) 29 (6).
- Guastoni A., Merlini M., De Battisti L. (2004). Hutchinsonite ricca in antimonio di Lengenbach (Valle di Binn, Svizzera). Riv. Miner. Ital., 3: 167.
- Guastoni A., De Battisti L. (2005). Eccezionale ritrovamento di ernigglite a Lengenbach, Valle di Binn, Svizzera. Riv. Mineral. Ital., 29, 1: 54-55.
- Guastoni, A., & De Battisti, L. (2006). Thalcusite. Un altro minerale di tallio scoperto a Lengenbach, Valle di Binn, Svizzera. Rivista Mineralogica Italiana, 30 (1), 54-55.
- Graeser, S., Cannon, R., Drechsler, E., Raber, T. and Roth, P., Eds. (2008): Faszination Lengenbach. Abbau – Forschung – Mineralien 1958-2008. Chr. Weise Verlag, Munich, 192 pp. (in German)
- Guastoni, A., De Battisti, L. (2009). Pearceite. Primo ritrovamento a Lengenbach, Valle di Binn, Svizzera. Rivista Mineralogica Italiana, 33 (3), 202-203.

- http://binn.strahlen.org/ ("All localities for minerals in the Binntal with detailed description")
- http://www.lengenbach.com/ (New 2008 website of the quarry)
- http://www.grube-lengenbach.ch/ (in German - presently not operating)
- http://www.grube-lengenbach.ch/Literatur/literatur.html