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Opal from
Rio Graia, Trontano, Verbano-Cusio-Ossola Province, Piedmont, Italy

Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
References
References:Mattioli, V. (1976): Località mineralogiche consigliate: Rio Graja, Trontano, Valle Vigezzo. Notiziario del Gruppo Mineralogico Lombardo, 2/1976, 40-42
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Rio Graia, Trontano, Verbano-Cusio-Ossola Province, Piedmont, Italy
Nearest other occurrences of Opal
2.8km (1.8 miles) Grignaschi quarry, Cosasca, Trontano, Verbano-Cusio-Ossola Province, Piedmont, Italy
10.3km (6.4 miles) I Mondei (Ca' Mondei), Montescheno, Verbano-Cusio-Ossola Province, Piedmont, Italy
12.7km (7.9 miles) Piano del Lavonchio (Piano dei Lavonchi), Rio Vasca, Craveggia, Verbano-Cusio-Ossola Province, Piedmont, Italy
13.5km (8.4 miles) Nibbio-Val Faera (Nibbio-Val Fredda) pegmatites, Mergozzo, Verbano-Cusio-Ossola Province, Piedmont, Italy
15.3km (9.5 miles) Verampio, Crodo, Verbano-Cusio-Ossola Province, Piedmont, Italy
20.0km (12.4 miles) Cadarese Quarries, Premia gneiss quarries, Premia, Verbano-Cusio-Ossola Province, Piedmont, Italy
21.3km (13.2 miles) Mont'Orfano (Montorfano), Mergozzo, Verbano-Cusio-Ossola Province, Piedmont, Italy
24.4km (15.2 miles) Gischi glacier (incl. Gischihorn), Kriegalp Valley (Chriegalp Valley), Binn Valley, Valais, Switzerland
24.6km (15.3 miles) Seula mine (ex Montecatini quarry), Mount Camoscio, Oltrefiume, Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy
25.7km (15.9 miles) Wanni glacier - Scherbadung area (Monte Cervandone), Kriegalp Valley (Chriegalp Valley), Binn Valley, Valais, Switzerland
 
Mineral and/or Locality  
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