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Chalcedony from
Rodeo Beach, Marin Co., California, USA

Locality type:Beach
Classification
Species:Quartz var: Chalcedony
Formula:SiO2
Confirmation
Validity:Believed Valid
References
References:Elder, W. P. (2001). Geology of the Golden Gate Headlands. Geology and Natural History of the San Francisco Bay Area: A Field-trip Guidebook. US Geological Survey Bulletin, 2188.
Data
Mineral Data:Click here to view Chalcedony data
Locality Data:Click here to view Rodeo Beach, Marin Co., California, USA
Nearest other occurrences of Chalcedony
12.2km (7.6 miles) San Francisco, San Francisco Co., California, USA
15.7km (9.7 miles) Bolinas, Marin Co., California, USA
16.8km (10.5 miles) Agate Beach, Bolinas, Marin Co., California, USA
28.4km (17.6 miles) Unnamed gemstone occurrence [1], Berkeley, Alameda Co., California, USA
48.0km (29.9 miles) La Vista Quarry and mill, Hayward, Alameda Co., California, USA
64.3km (40.0 miles) Pescadero Beach Mine, Pescadero, San Mateo Co., California, USA
67.9km (42.2 miles) La Joya Mine, Oakville, Oakville Mining District, Napa Co., California, USA
68.4km (42.5 miles) Bella Oak Mine (Belle Oak Mine; Oakville Mine; Bella Union Mine), Oakville, Oakville Mining District, Napa Co., California, USA
84.7km (52.6 miles) Great Eastern and Mount Jackson Mine (Sonoma Mine; Sonoma Quicksilver Mines; Guerneville Mine; Great Eastern Mine; Mount Jackson Mine), Guerneville, Guerneville Mining District, Coast Range, Sonoma Co., California, USA
85.6km (53.2 miles) Lone Hill Quarry (Mirasson Brothers Quarry), Lone Hill, San Jose, Santa Clara Co., California, USA
 
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