An amazing square back quartz crystal cluster from Arkansas. This stunning cluster is called a square back because it formed on top of a calcite bed which later weathered out leaving square cavities on the bottom. There is a contact area across the back edge where the cluster was once attached to another crystal. Weighs 1 Lb. 14 oz. Stands up on its own base. Size: 6 1/2" long x 5" wide x 5" tall.