A very characteristic specimen of Jamesonite originally collected in 1980 from the Tresungers Mine, St. Endelion, Cornwall. An old mine probably working the discontinuous Antimony deposits in this area in about 1810. The specimen displays a compact plume-like development of bright silvery grey Jamesonite, formed between Siderite-Killas cheeks. Classic Jamesonite specimen from the mine area.