Cavities in Cornwallite are richly lined with lustrous crystals of Libethenite from the East Gunnislake Mine, Cornwall. Crystals of dark olive green Libethenite measuring to 1mm form an inter grown druse, on cavities measuring to 2.5cm by 2.5cm. The blueish green Cornwallite has minutely botryoidal surface heavily investing a milky white to colourless Quartz veinstone. A rich Lebethenite-Cornwallite specimen from this old Cornish Copper mine.