| Locality type: | Mine |
| Classification |
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| 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 |
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| Validity: | Believed Valid |
| Data |
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| 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 |
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| Mindat Occurrence Record ID: | 2562 |
| Long-form Identifier: | 1:3:2562:1 |
| GUID (UUID V4): | 33cae6e6-0526-4f4b-9483-42c344f73944 |
| References |
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| Reference Search (possible matching items) |
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 | | Book | | Minerals of the English Lake District Caldbeck Fells Cumbria. Caldbeck. Mineral deposts 1. Title 11. Stanley...largely of debris washed down fromthe Roughton Gill mine dumps under Iron Crag C O N T E N INTRODUCTION...Caldbeck and the Caldbeck Fells Are worth all England else (Hutchinson. 1794) is supposed to have originated...mineral occurrences of the area, Fig. 1 ROUGHTON GiLL: the beck drops some 120 metres (400 feel) in a...Balliway Rigg on the west. Mineral veins crossing the gill have been worked for centuries, making and losing |
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