Group of quartz crystals, most of them doubly terminated, of a very good size and hyaline. They present numerous inclusions of sphalerite and chalcopyrite. Various crystals of cassiterite also stand out, one of them of very good size and luster. The main crystal is: 8,2 x 2,0 x 2,0 cm. 3,23 x 0,79 x 0,79 inc.