Chalcopyrite

A pleasing specimen composed entirely of Chalcopyrite which shows many crystallised faces and is capped with by two near-complete Chalcopyrite crystals, both of about 1.7 cm across.  Most of the crystal faces exhibit distinct chevroned growth patterns, all with an attractive mellow, slightly tarnished, brassy patina with a little iridescence.  A classic specimen from the Fowey Consols mine at Tywardreath, in the St Austell mining district of Cornwall.