A fine aesthetic specimen of complex Chalcopyrite crystals, are seen atop intergrown biscuit coloured saddle habit Siderite crystals, from the Carn Brea Mine, Illogan. Crystals of metallic yellow Chalcopyrite measure to 1.2cm with a tint of greenish iridescence. The specimen is known to have been in the S.A.Rust collection in the late 1970s, before coming to the Glyn Cunnick collection. A fine Chalcopyrite crystal specimen.