| Locality type: | Deposit |
| Classification |
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| Species: | 'Serpentine Subgroup' (not an IMA approved species) |
| Formula: | D3[Si2O5](OH)4 |
| Confirmation |
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| Validity: | Believed Valid |
| Data |
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| Mineral Data: | Click here to view Serpentine Subgroup data |
| Locality Data: | Click here to view Challenge deposit, Redwood City, San Mateo County, California, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 1207754 |
| Long-form Identifier: | 1:3:1207754:6 |
| GUID (UUID V4): | 50921c25-c582-4f2a-ae67-35b91cc10739 |
| Nearest other occurrences of Serpentine Subgroup |
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| 8.3km (5.2 miles) | ⓘJ. M. MacDonough Ranch Mine, Portola Valley, San Mateo County, California, USA |
| 9.1km (5.6 miles) | ⓘUnnamed Cr occurrence [1], Upper Crystal Springs Reservoir (Crystal Springs Lake), San Mateo, San Mateo County, California, USA |
| 38.5km (23.9 miles) | ⓘAlum Rock Canyon, East Foothills, Black Wonder Mining District, Santa Clara County, California, USA |
| 42.4km (26.4 miles) | ⓘGuadalupe Mine, New Almaden, New Almaden Mining District, Santa Clara County, California, USA |
| 42.9km (26.7 miles) | ⓘSenator Mine (El Senador), New Almaden, New Almaden Mining District, Santa Clara County, California, USA |
| 43.0km (26.7 miles) | ⓘFort Point, San Francisco, San Francisco County, California, USA |
| 43.5km (27.0 miles) | ⓘGreenwalls property, El Sombroso, Santa Clara County, California, USA |
| 43.9km (27.3 miles) | ⓘSmith prospect (Smith property), Edenvale, San Jose, Santa Clara County, California, USA |
| 44.4km (27.6 miles) | ⓘSan Antonio Mine, New Almaden, New Almaden Mining District, Santa Clara County, California, USA |
| 44.6km (27.7 miles) | ⓘHahn Ranch deposits, New Almaden, New Almaden Mining District, Santa Clara County, California, USA |
| References |
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