Rock Crystal Ball
Rock Crystal is the clear colorless form of the mineral quartz. As such it is related to amethyst which is the purple form of quartz and citrine which is the yellow variety. Rhinestone was originally quartz pebbles from the Rhine river
It owes its name to the ancients Greeks who found it in caves near Mount Olympus, and called it krustallos meaning ice, as they believed it to be water which had been permanently frozen by the gods.