| Locality type: | Valley |
| 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 Sissone Valley, Chiesa in Valmalenco, Sondrio Province, Lombardy, Italy |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 146018 |
| Long-form Identifier: | 1:3:146018:6 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Opal |
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| 25.7km (15.9 miles) | ⓘTanno Pegmatitic Field, Chiavenna, Sondrio Province, Lombardy, Italy |
| 32.2km (20.0 miles) | ⓘParsettens Alp, Err valley, Tinizong (Tinzen), Surses, Albula Region, Grisons, Switzerland |
| 50.5km (31.4 miles) | ⓘCepina, Valdisotto, Sondrio Province, Lombardy, Italy |
| 58.4km (36.3 miles) | ⓘSementina, Bellinzona, Bellinzona, Ticino, Switzerland |
| 72.7km (45.2 miles) | ⓘMadonna d'Ongero, Carona, Lugano, Ticino, Switzerland |
| 78.3km (48.6 miles) | ⓘPuricelli Quarry, Cavagnano, Cuasso al Monte, Varese Province, Lombardy, Italy |
| 78.4km (48.7 miles) | ⓘSubalpina Quarry (Mantegazza Quarry; Gebel Quarry; Bianchi Quarry), Cavagnano, Cuasso al Monte, Varese Province, Lombardy, Italy |
| 78.4km (48.7 miles) | ⓘLaghetto Quarry, Cavagnano, Cuasso al Monte, Varese Province, Lombardy, Italy |
| 78.5km (48.8 miles) | ⓘBonomi Quarry, Cuasso al Piano, Cuasso al Monte, Varese Province, Lombardy, Italy |
| 80.6km (50.1 miles) | ⓘLake Tremorgio, Fiesso, Prato (Leventina), Leventina, Ticino, Switzerland |
| References |
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Marchesini, M., Appiani, R., Donati, E., Foianini, I., Foianini, S., Andò, S. (2025): I minerali della Val Sissone (Sondrio) - Ritrovamenti storici e nuove scoperte da una classica località alpina. Micro, 23, 1-218. DOI: https://doi.org/10.57635/MICRO.2025.23.1 |
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