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Lengenbach quarry, Binn, Valais, Switzerland

 

Lengenbach web

 

The Lengenbach Quarry (LGB) is located in the Binn Valley (Valais, Switzerland) and it is famous among the mineralogist community for its unusual sulfosalt specimens.

These minerals have been highly appreciated in the past and also today, due to various factors: the rarity and the diversity of the mineral species collected, the notable perfection of crystals... and also for its esthetic contrast with the snowy dolomite matrix.

For nearly 200 years, many mineralogists from Europe have devoted a large number of efforts to study the peculiar mineralization of Lengenbach. Today, the geology of the quarry is known in detail as well as the structure of the crystalline sulfosalts collected there. The systematic studies of the collected minerals have contributed to the Mineralogy with a large number of new minerals never described before. Lengenbach is Type Locality for 29 accepted new minerals, 29 new sulfosalts and 1 new phosphate (2008).

Visit the website:
www.lengenbach.com




RM1654   Dufrénoysite

Lengenbach quarry, Imfeld, Binn, Valais, Switzerland

Rich group of needle to fibrous like dufrénoysite crystals, brilliant and disposed in a vug (12x7 mm) in the dolomite matrix. Dufrénoysite is now a member of sartorite group. With the FGL (Forschungsgemeinschaft Lengenbach) label L-10-4404 and from the Type Locality.


Size: 6.5 × 4.5 × 2.5 cm
Found in 2010.

Localidad Tipo - Type Locality


 

RM944   Seligmannite with dufrénoysite

Lengenbach quarry, Imfeld, Binn, Valais, Switzerland

Small group of very brilliant seligmannite crystals, like mirrors, gray to dark brown color. They show well defined faces and edges. Accompanied by needle-like crystals of dufrénoysite, with fibrous appearance and almost black color, interpenetrating with seligmannite. A premium quality specimen for systematic collectors. BOTH SPECIES have the type locality in Lengenbach.
Code: LB 779 (1999)


Size: 5.1 x 3.5 x 3.5 cm.
Main crystal: 3 x 2 mm.
Found in 1999.

 

RM943   Sartorite with realgar

Lengenbach quarry, Imfeld, Binn, Binntal, Valais, Switzerland

A really interesting specimen of this uncommon sulphosalt. It presents elongated crystals, one with terminal faces, metallic luster and it is accompanied by brilliant realgar red crystals, some of them grew on sartorite. On the LGB dolomite matrix with pyrite. From this classic Swiss locality, type locality for the species.
Code: L 23.729 (1992)


Size: 4.3 x 3.0 x 2.8 cm.
Main crystal: 7.5 x 3.5 mm
Found in 1992.

 

RM942   Asbecasite

Wannigletscher, Scherbadung area (Monte Cervandone), Kriegalptal, Binntal, Valais, Switzerland

Find specimens of this rare arsenite-silicate is a hard job. In this specimen we have an aggregate of crystals of asbecasite, with a good orange color, with some visible faces, but fragmented. It is accompanied in the matrix by chlorite, quartz and epidote crystals. A specimen to represent the species in a systematic collection. From the type locality for the species.


Size: 3.8 x 2.8 x 1.6 cm.
Main crystal: 4 x 2 mm. (aggr)

 
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