Here is an amazing specimen featuring a group of twinned cubic pyrite crystals which are set in the creamy marl matrix in which they grew. The pyrite crystals are up to 1.7" tip-to-tip, and they have a bright metallic luster with an eye-catching, bright brassy golden color. The crystals are astonishingly geometrical, with razor sharp edges and corners, like the finest specimens from this classic Spanish locality. These crystals are about as perfect as Mother Nature has made anywhere on earth.