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Calcio-duftite from
Brandy Gill Mine, Mungrisdale, Eden, Cumbria, England, UK
| Locality type: | Mine | |
| Classification | ||
|---|---|---|
| Species: | Duftite var: Calcio-duftite | |
| Formula: | (Pb,Ca)CuAsO4(OH) | |
| Comments: | Cooper & Stanley (1990): Kingsbury & Hartley claimed that material they had collected resembled, but was not identical with duftite was actually an intermediate between duftite and conichalcite. They coined the term 'calcio-duftite' for this mineral on the basis of the intermediate nature of the x-ray powder spacings and a qualitative (spectrographic) analysis that showed significant calcium. Claringbull also mentioned the affinity of the x-ray pattern of Brandy Gill duftite with conichalcite and commented on the variation of refractive index within individual spherules of the mineral which, he suggested, resulted from a corresponding variation in composition with the core being richer in lead than the outer areas. | |
| Confirmation | ||
| Validity: | Believed Valid | |
| Data | ||
| Mineral Data: | Click here to view Calcio-duftite data | |
| Locality Data: | Click here to view Brandy Gill Mine, Mungrisdale, Eden, Cumbria, England, UK | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 2562 | |
| Long-form Identifier: | 1:3:2562:1 | |
| GUID (UUID V4): | 0 | |
| References | ||
