| 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 Tanno Pegmatitic Field, Chiavenna, Sondrio Province, Lombardy, Italy |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 902575 |
| Long-form Identifier: | 1:3:902575:2 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Opal |
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| 25.7km (15.9 miles) | ⓘSissone Valley, Chiesa in Valmalenco, Sondrio Province, Lombardy, Italy |
| 35.0km (21.8 miles) | ⓘSementina, Bellinzona, Bellinzona, Ticino, Switzerland |
| 35.9km (22.3 miles) | ⓘParsettens Alp, Err valley, Tinizong (Tinzen), Surses, Albula Region, Grisons, Switzerland |
| 54.7km (34.0 miles) | ⓘMadonna d'Ongero, Carona, Lugano, Ticino, Switzerland |
| 55.7km (34.6 miles) | ⓘLake Tremorgio, Fiesso, Prato (Leventina), Leventina, Ticino, Switzerland |
| 60.6km (37.6 miles) | ⓘPuricelli Quarry, Cavagnano, Cuasso al Monte, Varese Province, Lombardy, Italy |
| 60.9km (37.8 miles) | ⓘLaghetto Quarry, Cavagnano, Cuasso al Monte, Varese Province, Lombardy, Italy |
| 60.9km (37.8 miles) | ⓘSubalpina Quarry (Mantegazza Quarry; Gebel Quarry; Bianchi Quarry), Cavagnano, Cuasso al Monte, Varese Province, Lombardy, Italy |
| 61.0km (37.9 miles) | ⓘBonomi Quarry, Cuasso al Piano, Cuasso al Monte, Varese Province, Lombardy, Italy |
| 71.4km (44.4 miles) | ⓘPiano del Lavonchio (Piano dei Lavonchi), Rio Vasca, Craveggia, Verbano-Cusio-Ossola Province, Piedmont, Italy |
| References |
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