Brilliant sharp striated cubic crystals of pyrite to 1.8 cm on edge across the top of this lustrous black sphalerite crystal matrix with quartz. The sphalerite crystals measure to 1.2 cm in size. This is in very good condition with only minimal micro-chipping to some of the quartz crystals at the far lower right side of the piece. Overall size is 6.0 x 5.0 x 2.0 cm. Ex D. Weinrich collection.