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Chrysocolla from
Red Gill Mine, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK
| Locality type: | Mine | |
| Classification | ||
|---|---|---|
| Species: | Chrysocolla | |
| Formula: | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 | |
| Comments: | Bridges et al. (2008): "two specimens of typical material were analysed by XRD in this study. One was a pale turquoise blue specimen with occasional desiccation cracks and the second was pale green with a conchoidal fracture and waxy lustre. Long, high-resolution XRD scans were performed on relatively thick powder specimens of both. The blue specimen produced no crystalline peaks whatever, while the green specimen produced a faint malachite pattern on a broad amorphous background. EDS showed copper and silicon to be the only heavy metal elements present and in variable amounts. 'Chrysocolla' has been reported from numerous localities in the Caldbeck Fells, but we are not aware of specimens that have been confirmed by XRD. Furthermore, the XRD patterns that are supposed to be characteristic of chrysocolla (published in the JCPDS index) are widely variable. Moreton (2007) investigated soft copper bearing gels from Tankardstown Mine, Co. Waterford in some detail and made comparisons with similar deposits from elsewhere and with material similar to the 'mineral' often called chrysocolla from the Caldbeck Fells. He concluded that these deposits are best referred to as 'copper-bearing silica gel'." | |
| Habit: | (botryoidal) crusts and coatings; pseudomorphs after radiating sprays of malachite and as epimorphs after acicular cerussite | |
| Colour: | blue to green | |
| Confirmation | ||
| Validity: | Unconfirmed/Questioned | |
| Associated Minerals Based on Photo Data: | ||
| Linarite | 1 | |
| Cerussite | 1 | |
| Data | ||
| Mineral Data: | Click here to view Chrysocolla data | |
| Locality Data: | Click here to view Red Gill Mine, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 15574 | |
| Long-form Identifier: | 1:3:15574:4 | |
| GUID (UUID V4): | 0 | |
| Nearest other occurrences of Chrysocolla | ||
| 0.6km (0.4 miles) | ⓘDry Smale Gill, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK | |
| 0.7km (0.5 miles) | ⓘSilver Gill, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK | |
| 0.8km (0.5 miles) | ⓘRoughton Gill Mine, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK | |
| 0.9km (0.6 miles) | ⓘBalliway Rigg, Caldbeck, Allerdale, Cumbria, England, UK | |
| 0.9km (0.6 miles) | ⓘBrae Fell Mine, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK | |
| 1.1km (0.7 miles) | ⓘThief Gills, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK | |
| 1.1km (0.7 miles) | ⓘHigher Roughton Gill (Balliway Rigg), Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK | |
| 1.8km (1.1 miles) | ⓘHay Gill Copper Mine, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK | |
| 2.1km (1.3 miles) | ⓘShort Grain, Deer Hills, Caldbeck, Allerdale, Cumbria, England, UK | |
| 2.3km (1.4 miles) | ⓘLonglands Fell Mine, Ireby and Uldale, Allerdale, Cumbria, England, UK | |
| References | ||
