Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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Opal from
Mount Pisgah Vineyard, Fetters Hot Springs, Sonoma County, California, USA


Locality type:Mountain
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Mount Pisgah Vineyard, Fetters Hot Springs, Sonoma County, California, USA
Data Identifiers
Mindat Occurrence Record ID:1005818
Long-form Identifier:1:3:1005818:5
GUID (UUID V4):0
Nearest other occurrences of Opal
8.1km (5.0 miles) ⓘFelder Mine, El Verano, Sonoma Mountains, Sonoma County, California, USA
8.2km (5.1 miles) ⓘWeise Clay pit, Weise Ranch, Glen Ellen, Sonoma County, California, USA
8.7km (5.4 miles) ⓘRichter deposit, Glen Ellen, Sonoma Mountains, Sonoma County, California, USA
10.1km (6.3 miles) ⓘDiatomite occurrence (1), Oakville, Oakville Mining District, Napa County, California, USA
16.1km (10.0 miles) ⓘBasalt Rock Company Mine, Vichy Springs, Napa County, California, USA
26.0km (16.2 miles) ⓘKellett Mine, Calistoga, Napa County, California, USA
34.1km (21.2 miles) ⓘGoodman Brothers deposit, Mark West Springs, West Mayacmas Mining District, Sonoma County, California, USA
35.8km (22.2 miles) ⓘCavagnaro prospect, Calistoga Hot Springs, Napa County, California, USA
37.6km (23.4 miles) ⓘCorona Mines (Vallejo Mines), Twin Peaks, Calistoga, Napa County, California, USA
39.3km (24.4 miles) ⓘPinole prospect (Pinole Dohrman; Pawsey; Dohrman Pawsey), Bayview-Montalvin, Contra Costa County, California, USA
References
Honke, Martin T., Jr. & Wm. E. Ver Planck, Jr. (1950), Mines and mineral resources of Sonoma County, California: California Journal of Mines and Geology: 46(1): 97
Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 152, 378 pp.: 282.
 
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