Collector Grade Large Arkansas Clear Quartz Crystal ClusterClear Quartz Crystal Cluster for Sale This beautiful, large, collector grade quartz crystal cluster was hand dug at Ron Coleman Mine. Our natural crystals are washed with natural spring water to remove mud, then soaked in oxalic acid, and thoroughly rinsed again. People are frequently surprised to learn that the crystal points form naturally, and we do not cut or polish the specimens we dig. This cluster of crystals possesses many of the fabulous