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Opal from
Fornaci di Montignoso Quarry (Bi.Bru Quarry), Montignoso, Montaione, Metropolitan City of Florence, Tuscany, Italy

Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
References
References:· Betti, C., Bazzoni, C., Bernocchi, M., Pagani, G., Ciriotti, M.E., Bittarello, E., Batoni, M., Batacchi, C. (2017): Poggio del Cornocchio e dintorni (Firenze - Pisa - Siena): storia, miniere e minerali di una zona poco conosciuta. Micro, 15, 1, 2-43.
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Fornaci di Montignoso Quarry (Bi.Bru Quarry), Montignoso, Montaione, Metropolitan City of Florence, Tuscany, Italy
Nearest other occurrences of Opal
36.7km (22.8 miles) Le Cetine di Cotorniano Mine (Le Cetine Mine; Cetine Mine; Rosia), Chiusdino, Siena Province, Tuscany, Italy
40.2km (25.0 miles) Montemassi, Collesalvetti, Livorno Province, Tuscany, Italy
40.3km (25.0 miles) Fortullino, Rosignano Marittimo, Livorno Province, Tuscany, Italy
40.7km (25.3 miles) Petrified wood occurrence, Collesalvetti, Livorno Province, Tuscany, Italy
41.3km (25.6 miles) Petrified wood occurrence, Livorno (Leghorn), Livorno Province, Tuscany, Italy
53.3km (33.1 miles) Maffei Mine, Botro ai Marmi, Campiglia Marittima, Campigliese (Campiglia Mountains; Campiglia Ridge), Livorno Province, Tuscany, Italy
85.2km (52.9 miles) Torre di Rio - Santa Filomena area (Monte della Torre), Rio Marina, Elba Island, Livorno Province, Tuscany, Italy
90.0km (56.0 miles) Lucchetti Quarry (Strinato B Quarry; Strinato Quarry), Fantiscritti, Miseglia quarrying basin (Miseglia-Fantiscritti quarrying basin; Fantiscritti quarrying basin), Carrara, Massa-Carrara Province, Tuscany, Italy
100.0km (62.1 miles) San Piero in Campo, Campo nell'Elba, Elba Island, Livorno Province, Tuscany, Italy
 
Mineral and/or Locality  
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