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It's a showdown with rare earth elemental ore Monazite-(Ce) and index mineral Andalusite.
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Chalcedony from
Campivecchi Mine (Puccioni Mine), Montoccoli-Castellaccia area (Fosso Zanca-Filone di Montoccoli area; Zanca Valley mines), Massa Marittima, Grosseto Province, Tuscany, Italy


Locality type:Mine
Classification
Species:Quartz var: Chalcedony
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcedony data
Locality Data:Click here to view Campivecchi Mine (Puccioni Mine), Montoccoli-Castellaccia area (Fosso Zanca-Filone di Montoccoli area; Zanca Valley mines), Massa Marittima, Grosseto Province, Tuscany, Italy
Data Identifiers
Mindat Occurrence Record ID:954364
Long-form Identifier:1:3:954364:5
GUID (UUID V4):0
Nearest other occurrences of Chalcedony
11.4km (7.1 miles) ⓘNuova Bartolina Quarry, Giuncarico, Gavorrano, Grosseto Province, Tuscany, Italy
14.9km (9.3 miles) ⓘPodere Montevecchio (Podere Montevecchio Mine; Miniera della Sambuca), Gerfalco, Montieri, Grosseto Province, Tuscany, Italy
24.8km (15.4 miles) ⓘCanneto Mount, Canneto, Monteverdi Marittimo, Pisa Province, Tuscany, Italy
26.0km (16.2 miles) ⓘPoggio Peloso, Civitella Paganico, Grosseto Province, Tuscany, Italy
26.3km (16.3 miles) ⓘTemperino Mine, Campiglia Marittima, Livorno Province, Tuscany, Italy
28.5km (17.7 miles) ⓘPoggio Castiglione, Canneto, Monteverdi Marittimo, Pisa Province, Tuscany, Italy
28.5km (17.7 miles) ⓘMonterufoli, Pomarance, Pisa Province, Tuscany, Italy
29.8km (18.5 miles) ⓘMalentrata, Pomarance, Pisa Province, Tuscany, Italy
30.7km (19.1 miles) ⓘBagni di Petriolo (Terme di Petriolo), Monticiano, Siena Province, Tuscany, Italy
33.1km (20.6 miles) ⓘLa Sassa, Montecatini Val di Cecina, Pisa Province, Tuscany, Italy
References
Bazzoni C., Mangoni G., Capperi M., Bernocchi M. (2011): Montoccoli-Castellaccia: I minerali delle miniere nella valle del torrente Zanca (Grosseto). Riv. Mineral. Ital., 35, 2 (2-2011), 76-89.
 
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