| Locality type: | Pit |
| 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 Old Greensand-Diatomaceous Earth Pit, Calvert County, Maryland, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 997592 |
| Long-form Identifier: | 1:3:997592:7 |
| GUID (UUID V4): | cc93f411-23a2-43c5-b398-0ed880d9f0c8 |
| Nearest other occurrences of Opal |
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| 45.1km (28.0 miles) | ⓘWhite Oak, Montgomery County, Maryland, USA |
| 45.3km (28.1 miles) | ⓘPaint Branch, Silver Spring, Montgomery County, Maryland, USA |
| 56.9km (35.4 miles) | ⓘGarey Ore Bank, Anne Arundel County, Maryland, USA |
| 61.6km (38.3 miles) | ⓘHunting Hill Quarry, Rockville, Montgomery County, Maryland, USA |
| 65.2km (40.5 miles) | ⓘCentreville, Culpeper Basin, Fairfax County, Virginia, USA |
| 67.6km (42.0 miles) | ⓘPatapsco Glen Construction Site, Woodlawn, Baltimore County, Maryland, USA |
| 69.2km (43.0 miles) | ⓘLord Baltimore Drive Quartz occurrence area, Windsor Mill, Baltimore County, Maryland, USA |
| 72.2km (44.9 miles) | ⓘVulcan Materials Company Crushed Stone Quarry (Manassas Quarry), Manassas, Prince William County, Virginia, USA |
| 75.0km (46.6 miles) | ⓘBull Run Quarry, Conklin, Loudoun County, Virginia, USA |
| 75.2km (46.8 miles) | ⓘUnnamed Chromite prospects, Bare Hills, Baltimore County, Maryland, USA |
| References |
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