(Simplon-Eisenbahntunnel (Nordabschnitt), Simplonpassgebiet, Brig, Wallis (Valais), Schweiz (Suisse; Svizzera))
Finds in material excavated during construction of the two tubes of the tunnel (1898-1905, and 1912-1921). The north portal is located near Biela, east of Brig, its south portal near Iselle in the Ossola Valley (Italy).
Ref.: 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.
Mineral List:37 entries listed. 30 valid minerals.
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