A rich, classic, specimen of botryoidal, green cornwallite in a boxwork, matrix with quartz, granular massive barite, and goethite from Wheal Carpenter, Fraddam, Gwinear-Gwithian, Cornwall, England, UK. Cornwallite is the arsenate analogue of malachite. British Museum of Natural History label indicating it was collected by Arthur Kingsbury in 1952 and verified via XRD by Mike Rumsey in 2007. A nice specimen with good provenance. Ex. British Museum and Paulo Matioli collections.