In this good sized specimen we enjoy a group of arsenopyrite prismatic crystals, some of them doubly terminated, which form a very aesthetic aggregate in the central part of the piece. With an excellent luster and striated faces. They are accompanied by numerous crystals of cassiterite, very brilliant and cyclically twinned. On the back side, some very interesting ones. The matrix is a group of quartz crystals. The main crystal is: 2,6 x 2 x 1,7 cm. 1,02 x 0,79 x 0,67 In.