| Locality type: | Quarry |
| Classification |
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| Species: | Opal |
| Formula: | SiO2 · nH2O |
| Confirmation |
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| Validity: | Believed Valid |
| References |
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| References: | MRDS database Dep. ID file #10060227, MRDS ID #TC10194. |
| Data |
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| Mineral Data: | Click here to view Opal data |
| Locality Data: | Click here to view Andrada Marble Quarry, Helvetia-Rosemont Mining District, Pima Co., Arizona, USA |
| Nearest other occurrences of Opal |
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| 11.3km (7.0 miles) | | ⓘOmega Mine (Omega tunnel; Omega Extension Mine), Monument Mountain, Helvetia, Helvetia-Rosemont Mining District, Pima Co., Arizona, USA |
| 31.9km (19.8 miles) | | ⓘMission complex, San Xavier, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima Co., Arizona, USA |
| 32.2km (20.0 miles) | | ⓘCopper Glance Mine (Glance Mine), Stevens Mountain, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima Co., Arizona, USA |
| 34.8km (21.6 miles) | | ⓘPost Ranch deposit, Post Ranch, Cochise County, Arizona, USA |
| 47.9km (29.7 miles) | | ⓘSaint David area, Cochise County, Arizona, USA |
| 48.0km (29.8 miles) | | ⓘLyle Creek Diatomite deposits (Huachuca deposits), Huachuca Mountains Northwestern foothills, Redrock Mining District, Santa Cruz Co., Arizona, USA |
| 48.1km (29.9 miles) | | ⓘCurtis Diatomite deposit (Curtiss Diatomite deposit), Curtis, Cochise County, Arizona, USA |
| 50.2km (31.2 miles) | | ⓘEagle deposit, Redrock Mining District, Santa Cruz Co., Arizona, USA |
| 53.3km (33.1 miles) | | ⓘAmerican Mine (American shaft; War Eagle Mine; La Vantia Mine; La Ventia Mine), Cochise County, Arizona, USA |
| 63.5km (39.4 miles) | | ⓘGallagher Vanadium & Rare Minerals Corporation Mine (Gallagher vanadium property; Bradsher Mine; Stella Mine; Vogel Mine; Buena Vista Mine), Cochise County, Arizona, USA |
