CornwalliteOld Potts Gill Mine, Potts Gill, Caldbeck Fells, North and Western Region, Cumbria, England, UK
Photo: Rob Lavinsky UK Grid Reference: NY319365
Latitude: 54°43'7"N
Longitude: 3°3'26"W
OS NGR is for the Endeavour level, the site of the deepest workings.
Although a number of unusual copper minerals have been reported, the suite of minerals recorded by Kingsbury and Hartley in the 1950s are, given that Kingsbury has since been shown to have falsified a number of occurrences, considered suspect.
Kingsbury's minerals were said to have come from the Old number 1 cross-cut dumps at the head of the Gill (NY 320362) However, Cooper and Stanley (1990) note that Kingsbury's suite of minerals, which include chalcophyllite, conichalcite, devilline, dioptase, serpierite and tyrolite are unique in the district. Although corwallite has been found by subsequent collectors, the other rarities have not.
Cooper and Stanley (1990) also note that the newly described species Philipsburgite has since been identified on material collected over 20 years previously.
References
Minerals of the English Lake District - Caldbeck Fells. Cooper and Stanley, 1990
Mineral List
64 entries listed. 62 valid minerals.
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