| Locality type: | Pegmatite |
| Classification |
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| Species: | Opal |
| Formula: | SiO2 · nH2O |
| Confirmation |
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| Validity: | Believed Valid |
| Data |
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| Mineral Data: | Click here to view Opal data |
| Locality Data: | Click here to view Rio Graia, Trontano, Verbano-Cusio-Ossola Province, Piedmont, Italy |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 156309 |
| Long-form Identifier: | 1:3:156309:2 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Opal |
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| 2.8km (1.8 miles) | ⓘGrignaschi Quarry, Cosasca, Trontano, Verbano-Cusio-Ossola Province, Piedmont, Italy |
| 10.1km (6.3 miles) | ⓘRencio quarries, Crodo gneiss quarries, Crodo, Verbano-Cusio-Ossola Province, Piedmont, Italy |
| 10.3km (6.4 miles) | ⓘI Mondei (Ca' Mondei), Montescheno, Verbano-Cusio-Ossola Province, Piedmont, Italy |
| 11.8km (7.4 miles) | ⓘEglio, Craveggia, 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, Nibbio, Mergozzo, Verbano-Cusio-Ossola Province, Piedmont, Italy |
| 15.3km (9.5 miles) | ⓘVerampio-Crego area, 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), Binn, Goms, Valais, Switzerland |
| 24.6km (15.3 miles) | ⓘSeula mine, Mount Camoscio, Oltrefiume, Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy |
| References |
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