Hillehorn Mt. (northeast slope), Chummibort, Binn Valley, Wallis (Valais), Switzerland

An area with REE and As minerals in gneisses (a microcline augengneiss, containing most of the As minerals, and a fine-grained two-mica gneiss). The mineralogy is similar to that of the nearby (1.5 km) Mätti valley.

The Hillehorn is 3170 m high peak, swiss coordinates 654´070 / 128´200.

Refs.:
- Cuchet, S., van der Burgt, A. und Meisser, N. (2005): Chummibort, eine neue Fundstelle für Arsenmineralien im Binntal. Schweizer Strahler, Nr. 2, 19-29. (in German/French)
- van der Burgt, A. & Cuchet, S. (2006): Neu: Gasparit und Chernovit vom Chummibort. Lapis 31 (4), 35. (in German)
- http://www.strahlen.org/vp/ch/chummibort/