Particularly large crystals of Tennantite for the location at Wheal Jewel, St.Day, Cornwall. Wheal Jewel is a well regarded classic location for Tennantite specimens. The specimen we have displays inter grown Tennantite crystals individually measuring to 0.8cm, with a metallic grey colour. Smaller Tennantite crystals show a bright metallic grey colour. The Tennantite has developed on and through a milky Quartz matrix.