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Metavoltine from
Brigham Quarry, Brigham, Allerdale, Cumbria, England, UK
| Locality type: | Quarry | |
| Classification | ||
|---|---|---|
| Species: | Metavoltine | |
| Formula: | K2Na6Fe2+Fe63+O2(SO4)12 · 18H2O | |
| Comments: | It occurs as patchy, vivid yellow efflorescent crusts coating areas up to 1.5 m across of the lowest two sandstone beds exposed in the quarry. Individual crusts, which are up to 10 cm across and 0.5 mm thick, consist of rounded aggregates up to 1 mm across composed of minute platy crystals. The two sandstone beds are separated by a 25 mm thick dark grey carbonaceous mudstone parting. In places small patches of metavoltine encrust this parting, or are concentrated on the sandstone within 10 cm above or below this level. Oxidation of pyrite within the mudstone parting together with diffusion of sulphate-rich fluids through the surface layers of the adjacent very porous sandstone have almost certainly provided the source of the metavoltine. a | |
| Habit: | minute platy crystals | |
| Colour: | vivid yellow. | |
| Quality for species: | Good crystals or rich for species - important (!) | |
| Abundance at site: | Common | |
| Confirmation | ||
| Validity: | Believed Valid | |
| Data | ||
| Mineral Data: | Click here to view Metavoltine data | |
| Locality Data: | Click here to view Brigham Quarry, Brigham, Allerdale, Cumbria, England, UK | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 19217 | |
| Long-form Identifier: | 1:3:19217:0 | |
| GUID (UUID V4): | 0 | |
| References | ||
