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

(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)
  		• Fersmite
  		• Fergusonite-(Y)
  		• Kaolinite
  		• Laumontite
  		• Microcline
  		• Microlite
  		• Monazite-(Ce)
  		• Muscovite
  		• Opal
  		• Orthoclase
       var: Adularia
  		• Phosphuranylite
  		• Pyrochlore
  		• Quartz
  		• Samarskite-(Y)
  		• Tantalite
  		• Tanteuxenite-(Y) ?
  		• 'Tapiolite'
  		• Tapiolite-(Fe)
  		• 'Tourmaline Group'
  		• Uraninite
  		• Uranmicrolite
  		• Uranophane
  		• Xenotime-(Y)
  		• Zircon


    33 entries listed. 27 valid minerals.

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