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Chalcedony from
United States Mint site, Duboce Street near Market Street, San Francisco, San Francisco County, California, USA


Locality type:Industrial Site
Classification
Species:Quartz var: Chalcedony
Formula:SiO2
Comments:Occurs as veins in serpentine.
Confirmation
Validity:Believed Valid
Associated Minerals:
Associates:Idrialite
Pyroaurite
Serpentine Subgroup
Data
Mineral Data:Click here to view Chalcedony data
Locality Data:Click here to view United States Mint site, Duboce Street near Market Street, San Francisco, San Francisco County, California, USA
Data Identifiers
Mindat Occurrence Record ID:683942
Long-form Identifier:1:3:683942:0
GUID (UUID V4):0
Nearest other occurrences of Chalcedony
12.6km (7.8 miles) ⓘRodeo Beach, Marin County, California, USA
17.6km (10.9 miles) ⓘSpruce Street Thunder Egg locality, Berkeley, Alameda County, California, USA
19.2km (11.9 miles) ⓘUnnamed gemstone occurrence [1], Berkeley, Alameda County, California, USA
28.2km (17.5 miles) ⓘBolinas, Marin County, California, USA
29.4km (18.3 miles) ⓘAgate Beach, Bolinas, Marin County, California, USA
35.4km (22.0 miles) ⓘLa Vista Quarry, Hayward, Alameda County, California, USA
58.1km (36.1 miles) ⓘPescadero Beach Mine, Pescadero, San Mateo County, California, USA
73.1km (45.4 miles) ⓘBella Oak Mine (Belle Oak Mine; Oakville Mine; Bella Union Mine), Oakville, Oakville Mining District, Napa County, California, USA
73.2km (45.5 miles) ⓘLa Joya Mine, Oakville, Oakville Mining District, Napa County, California, USA
74.3km (46.1 miles) ⓘLone Hill Quarry (Mirasson Brothers Quarry), Lone Hill, San Jose, Santa Clara County, California, USA
References
Bradley, W.W. (1937), Thirty-third report of the State Mineralogist: California Division Mines Report 33: 71
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 165
 
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