Common Opal from
Downrew Quarry, Bishop's Tawton, North Devon, Devon, England, UK
| Locality type: | Quarry | |
| Classification | ||
|---|---|---|
| Species: | Opal var: Common Opal | |
| Formula: | SiO2 · nH2O | |
| Formation: | Secondary | |
| Comments: | Redeposited silica tubes formed in cracks in the Codden Hill Cherts which host a number of phosphate species. These thin-walled tubes appear to have formed in much the same way as speleothem 'straws', and various walls and ramifications appear across the rock surfaces. These same cracks also play host to the various phosphate minerals found at this location. | |
| Habit: | none: massive | |
| Colour: | white to off-white | |
| Luminescent properties: | none | |
| Quality for species: | Rock forming mineral/non-crystalline/little interest for collectors.(##) | |
| Abundance at site: | Common | |
| Special Storage/ Display Requirements: | Extremely fragile - the tube walls are less than a millimetre thick. | |
| Confirmation | ||
| Validity: | Believed Valid | |
| Associated Minerals Based on Photo Data: | ||
| Cacoxenite | β1 photo of Common Opal associated with Cacoxenite at this locality. | |
| Data | ||
| Mineral Data: | Click here to view Common Opal data | |
| Locality Data: | Click here to view Downrew Quarry, Bishop's Tawton, North Devon, Devon, England, UK | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 1235949 | |
| Long-form Identifier: | 1:3:1235949:5 | |
| GUID (UUID V4): | f166df36-5411-4bc0-bcd0-c00a29b39409 | |
| References | ||
Downrew Quarry, Bishop's Tawton, North Devon, Devon, England, UK