| Locality type: | Mine |
| Classification |
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| Species: | 'Silica' (not an IMA approved species) |
| Confirmation |
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| Validity: | Believed Valid |
| Data |
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| Mineral Data: | Click here to view Silica data |
| Locality Data: | Click here to view Roberts Sand Company Mine (Black Diamond Mine), Nortonville, Contra Costa County, California, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 716378 |
| Long-form Identifier: | 1:3:716378:4 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Silica |
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| 0.9km (0.5 miles) | ⓘUnnamed Silica mine [1], Nortonville, Contra Costa County, California, USA |
| 1.5km (0.9 miles) | ⓘAntioch Mine, Somersville, Contra Costa County, California, USA |
| 1.7km (1.0 miles) | ⓘPittsburg Sand Company Mine, Somersville, Contra Costa County, California, USA |
| 5.9km (3.7 miles) | ⓘAntioch-Marchio prospect, Antioch, Contra Costa County, California, USA |
| 17.0km (10.6 miles) | ⓘSilica Company of California Mine, Brentwood, Contra Costa County, California, USA |
| 21.9km (13.6 miles) | ⓘByron plant, Byron, Contra Costa County, California, USA |
| 41.4km (25.7 miles) | ⓘUnknown Silica prospect [1], Tesla, Livermore Mining District (Tesla District), Alameda County, California, USA |
| 76.4km (47.5 miles) | ⓘHammond occurrence (Silica No. 1), Copper Mountain, Black Wonder Mining District, Stanislaus County, California, USA |
| 78.3km (48.6 miles) | ⓘJ. J. Cummings and Thomas Wolf property, Patterson, Stanislaus County, California, USA |
| 89.0km (55.3 miles) | ⓘPacific Clay Products pit, Camanche, Camanche Mining District, Calaveras County, California, USA |
| References |
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