| Locality type: | Dam |
| 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 Rock Island Dam, Douglas County, Washington, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 420646 |
| Long-form Identifier: | 1:3:420646:0 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Opal |
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| 33.6km (20.9 miles) | ⓘDiatomite Mines (Diatomite Pit North), Quincy, Grant County, Washington, USA |
| 42.4km (26.4 miles) | ⓘDiatomite Mines (Diatomite Pit South), Frenchman Hills, Grant County, Washington, USA |
| 49.6km (30.8 miles) | ⓘVantage area, Kittitas County, Washington, USA |
| 53.1km (33.0 miles) | ⓘState Route 17 road cuts [2], Coulee City, Grant County, Washington, USA |
| 56.9km (35.4 miles) | ⓘState Route 17 road cut [1], Coulee City, Grant County, Washington, USA |
| 61.5km (38.2 miles) | ⓘSaddle Mountain, Mattawa, Grant County, Washington, USA |
| 67.0km (41.6 miles) | ⓘCoulee City Marina, Coulee City, Grant County, Washington, USA |
| 72.2km (44.8 miles) | ⓘPerch Point-Potholes Reservoir (Medicare Beach), Warden, Grant County, Washington, USA |
| 72.5km (45.0 miles) | ⓘSelah Butte, Yakima County, Washington, USA |
| 76.4km (47.5 miles) | ⓘState Route 262 roadcuts, Warden, Grant County, Washington, USA |
| References |
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Rock Island Dam, Douglas County, Washington, USA