An unusual specimen from Wheal Jane 11-15 Decline, Kea, Cornwall. Well developed terminated crystals of Quartz measuring to 1.2cm, are in interconnected ridges and clusters, having a greenish tint due to Chlorite-Pyrite inclusions. On crudely formed crystals matrix of Chalcopyrite. Crystals of Pyrite have been deposited on the Chalcopyrite, and on the Quartz crystals.