| Locality type: | Mine |
| Classification |
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| Species: | Opal |
| Formula: | SiO2 · nH2O |
| Comments: | Occurs as opalized chalcedony (sic). |
| Confirmation |
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| Validity: | Believed Valid |
| Associated Minerals: |
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| Associates: | Cinnabar
Dolomite
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| Data |
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| Mineral Data: | Click here to view Opal data |
| Locality Data: | Click here to view Hillsdale Mine (Chaboya-Hillsdale Mine; San Juan Bautista Mine; San Juan Mine; San Juan Quicksilver Mine; Sheboya Mine; Chapman Mine; Oak Hill Mine), Oak Hill, San Jose, Santa Clara County, California, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 672798 |
| Long-form Identifier: | 1:3:672798:7 |
| GUID (UUID V4): | d188a052-a2c1-447d-99ca-696e607ab1d2 |
| Nearest other occurrences of Opal |
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|
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| 9.5km (5.9 miles) | ⓘGuadalupe Mine, New Almaden, New Almaden Mining District, Santa Clara County, California, USA |
| 12.6km (7.8 miles) | ⓘNew Almaden Mine (New Almaden Mines), New Almaden, New Almaden Mining District, Santa Clara County, California, USA |
| 18.2km (11.3 miles) | ⓘO'Connell Mine (Greenwalls property; O'Connell Ranch Mine; O'Connell Number 1; Greenwalt), Coyote, Coyote Mining District, Santa Clara County, California, USA |
| 63.0km (39.1 miles) | ⓘSimon Newman Company deposit, Crows Landing, Stanislaus County, California, USA |
| 73.2km (45.5 miles) | ⓘSan Francisco, San Francisco County, California, USA |
| 79.8km (49.6 miles) | ⓘWork Ranch deposit, Del Rey Oaks, Santa Lucia Mts (Santa Lucia Range), Monterey County, California, USA |
| 89.2km (55.4 miles) | ⓘPinole prospect (Pinole Dohrman; Pawsey; Dohrman Pawsey), Bayview-Montalvin, Contra Costa County, California, USA |
| 96.6km (60.0 miles) | ⓘUnnamed Diatomite deposits (1), California Aquaduct Dos Amigos Pumping Station, Merced County, California, USA |
| 99.0km (61.5 miles) | ⓘAgricultural Minerals & Fertilizer Company, California Aquaduct Dos Amigos Pumping Station, Merced County, California, USA |
| References |
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