Opal from
South Terras Mine (Resugga & Tolgarrick Mine; Union Mine; Uranium Mine), St Stephen-in-Brannel, Cornwall, England, UK
| Locality type: | Mine | |
| Classification | ||
|---|---|---|
| Species: | Opal | |
| Formula: | SiO2 · nH2O | |
| Formation: | Secondary | |
| Comments: | Observed initially as a white surface layer of less than 0.5mm covering a brown agate coating. When wetted, this layer becomes transparent and gradually returns to an opaque white as it dries out. | |
| Habit: | Massive | |
| Colour: | white-transparent | |
| Luminescent properties: | No reaction with LW UV | |
| Quality for species: | Poor for species, only of interest for locality collectors. (#) | |
| Confirmation | ||
| Validity: | Confirmed | |
| Confirmation Methods: | Visually Identified | |
| Analysis Reference: | 2018-06-STUM | |
| Associated Minerals Based on Photo Data: | ||
| Agate | ⓘ1 photo of Opal associated with Agate at this locality. | |
| Quartz | ⓘ1 photo of Opal associated with Quartz at this locality. | |
| Data | ||
| Mineral Data: | Click here to view Opal data | |
| Locality Data: | Click here to view South Terras Mine (Resugga & Tolgarrick Mine; Union Mine; Uranium Mine), St Stephen-in-Brannel, Cornwall, England, UK | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 1243650 | |
| Long-form Identifier: | 1:3:1243650:9 | |
| GUID (UUID V4): | 38147c2f-f91a-4c19-bb41-67ef68085516 | |
| Nearest other occurrences of Opal | ||
| 3.2km (2.0 miles) | ⓘVirginia China Clay Pit, Melbur, St Stephen-in-Brannel, Cornwall, England, UK | |
| 4.0km (2.5 miles) | ⓘStenna Gwyn Mine (Stennagwyn Mine), Foxhole, St Stephen-in-Brannel, Cornwall, England, UK | |
| 4.4km (2.7 miles) | ⓘRostowrack China Clay Pit, Hendra Downs, St Dennis, Cornwall, England, UK | |
| 4.5km (2.8 miles) | ⓘGreat Wheal Prosper China Stone Quarry, Hendra Downs, St Dennis, Cornwall, England, UK | |
| 5.0km (3.1 miles) | ⓘBlackpool China Clay Pit, Trewoon, St Mewan, Cornwall, England, UK | |
| 5.2km (3.2 miles) | ⓘWheal Remfry China Clay Pit, Fraddon, St Enoder, Cornwall, England, UK | |
| 6.6km (4.1 miles) | ⓘGreat Longstone China Clay Pit, Longstone Downs, St Mewan, Cornwall, England, UK | |
| 8.4km (5.2 miles) | ⓘGunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK | |
| 8.8km (5.5 miles) | ⓘWheal Trugo, Trebudannon, St Columb Major, Cornwall, England, UK | |
| 8.9km (5.5 miles) | ⓘGreat Wheal Prosper China Clay Pit, Trezaise (Tresayes), Roche, Cornwall, England, UK | |
| References | ||
South Terras Mine, St Stephen-in-Brannel, Cornwall, England, UK