A world-class cluster of perfectly terminated cubic pyrite crystals, interlocked on its natural basalt matrix. This specimen was discovered in the famous mines of Navajun, Spain - considered one of the finest locations in the world for pyrite. This museum-quality specimen has very large cubic crystals for the species. The cubes are completely natural, uncut, and unpolished with no damage, top luster, and perfect aesthetics. These crystals form naturally in the Basalt, exactly the way you see them.