| Locality type: | Mine |
| Classification |
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| Species: | Opal |
| Formula: | SiO2 · nH2O |
| Confirmation |
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| Validity: | Believed Valid |
| Data |
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| Mineral Data: | Click here to view Opal data |
| Locality Data: | Click here to view Peerless Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 304983 |
| Long-form Identifier: | 1:3:304983:9 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Opal |
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| 1.1km (0.7 miles) | ⓘEtta Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA |
| 3.9km (2.4 miles) | ⓘKing Lithia Mine, Greyhound Gulch, Keystone, Keystone Mining District, Pennington County, South Dakota, USA |
| 4.3km (2.7 miles) | ⓘBarker-Ferguson Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA |
| 4.9km (3.1 miles) | ⓘWood Tin mine, Harney City, Pennington County, South Dakota, USA |
| 11.2km (7.0 miles) | ⓘNovember Mine, The Needles, Custer State Park, Custer County, South Dakota, USA |
| 29.8km (18.5 miles) | ⓘHelen Beryl Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA |
| 60.9km (37.9 miles) | ⓘWharf Mine, Bald Mountain Mining District (Portland Mining District), Lawrence County, South Dakota, USA |
| 61.0km (37.9 miles) | ⓘDavier Mine, Annie Creek, Bald Mountain Mining District (Portland Mining District), Lawrence County, South Dakota, USA |
| References |
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Černý, P., Roberts, W. L., Ercit, T. S., Chapman, R. (1985) Wodginite and associated oxide minerals from the Peerless pegmatite, Pennington County, South Dakota. American Mineralogist, 70 (9-10) 1044-1049 |
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