 | | Journal (article/letter/editorial) | | Saskatchewan Library] at 03:35 01 August 2012 Chalcophyllite Wheal Gorland, Gwennap, Cornwall, England... This month’s Connoisseur’s Choice mineral—chalcophyllite—falls into the latter category, its name having...specimens from Wheal Tamar, Devon, England. Chalcophyllite occurs in a range of colors from emeraldgreen...druses are also reported. The general formula of chalcophyllite is Cu18Al2(AsO4)4 (SO4)3(OH)24.36H2O. No significant...[Cu2Al(AsO4)(OH)4.4H2O] by chalcophyllite has been found. Chalcophyllite is relatively rare compared |  | | Journal (article/letter/editorial) | | historically interesting localities as the old cobalt mine at Great Hill, East Hampton, Middlesex County, Connecticut;...Sussex County, New Jersey; the old Tilly Foster iron mine near Brewster, Putnam County, New York; Pennsylvania...counties, Missouri. It has been found in the Martin mine of the Upper Mississippi Valley lead-zinc district...district, Lafayette County, Wisconsin; and the Mohawk mine, Keweenaw County, Michigan. In the western United...with a thucolite-bearing vein exposed in the Evans mine at Placerville, San Miguel County, Colorado. Attractive |
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