(Pipjigletscher, Turtmanntal, Wallis (Valais), Schweiz (Suisse; Svizzera))
Turtmannite was found in Fe-Mn ores in paleokarst pockets in Triassic marbles of the Barrhorn unit.
Ref.:
- Brugger, J., Armbruster, T., Meisser, N., Hejny, C. & Grobety, B. (2001): Description and crystal structure of turtmannite, a new mineral with a 68 Å period related to mcgovernite. Am. Mineral. 86, 1494-1505.