Chalcopyrite var. Blister Copper

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Blister Copper, the unusual botryoidal variety of Chalcopyrite found in some of the copper mines in Cornwall is a fascinating and, in some cases beautiful mineral. This magnificent smaller display specimen very much fits into the latter category. In fact, it is absolutely stunning. There appears to be no doubt that the surface has been buffed up, or polished at some time, but the outcome is truly amazing. Most Blister Copper specimens are old, having been first found in mines like Cook's Kitchen during the mid- to late-18th century, but some were still being encountered in mines during the 19th century. This one has nothing to go on, other than "Cornwall", but it is exceptionally fine, with the most amazing burnished bronze patina. Ex Martin Kershaw Collection, no. 472.