There is legend about Sunstone in the West:
Prometheus modled human according to God's apprearance with clay which was kneaded by soil and water, and also endowed him a lot of skills. But he forget to give him skills how to make fire. So Prometheus ascended to heaven and borrow sun chariot from the Gold of Sun-- Titan, who is the symbol of victory and honor, and a angel bringing light and warmth for human beings. The human also lit a torch and send the started fire to the earth. However, Zeus is not willing to see that human use fire, so he take the started fire back. Therefore, Prometheus stole the fire from heave and sent it to human. Therefore, Zeus commanded to nail Prometheus on Caucasus Cliff firmly and claimed that he received what he due to as he betrayed Heaven and send fire to human. Prometheus surffered a lot of hardships, and blended with rock. Absorbing the sunshine everyday, saving bright and warmth, he was heat and light for human beings. Thousands of years later, it becomes a dark and bright fossil eventually. This is lendendary the source of life on earth-- Sunstone!