Rio Graia, Trontano, Vigezzo Valley, Ossola Valley, Verbano-Cusio-Ossola Province, Piedmont, Italy

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Rio Graia, Trontano, Val Vigezzo, Val d'Ossola, Verbano-Cusio-Ossola, Piemonte, Italia

Rio Graia pegmatite is famous for its large beryl xls, up to 10 cm long, and also for some rare species such as ferrotapiolite.

References:
- Boscardin, M.; Mattioli, G. & Pierini, C. (1982): Mikrolith und Columbite. LAPIS 7 (3), 17-19 [ with analysis of 2 columbites from Rio Graia]
- Callegari, A. & Vanini, F. (2002): La fersmite della pegmatite di Rio Graia. Rivista Mineralogica Italiana, 4/2002, 212-215.
- Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007): Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.

Mineral List

'Allanite' Arsenopyrite Autunite Bavenite Beryl Clinozoisite 'Columbite' Euxenite-(Y) Fergusonite-(Y)

Fersmite Kaolinite 'K Feldspar var: Adularia' Laumontite Microcline Microlite Group var: Uranmicrolite (of Hogarth 1977) Monazite-(Ce) Muscovite

Opal Orthoclase Phosphuranylite Pyrochlore Group Quartz Samarskite-(Y) 'Tantalite' Tanteuxenite-(Y) ? 'Tapiolite'

Tapiolite-(Fe) 'Tourmaline' Uraninite Uranophane Xenotime-(Y) Zircon

33 entries listed. 26 valid minerals.