An archetypal specimen of Cassiterite in an explosive lode breccia rock from the very old Relistian Mine, Gwinear, Cornwall. The rounded nature of the lode material is believed to be the result of the violent injection of hot hydrothermal fluids through the country rock, forming a rolling breccia. Veinlets and crystals of Cassiterite have developed around the breccia rock pebbles, with some white quartz and silvery Arsenopyrite. An intriguing specimen of explosive lode formation the mine.