Chrysocolla is a minor ore of copper, which forms in the oxidation zones of copper ore bodies The name chrysocolla was first used to describe the stone by Theophrastus, a Greek philosopher, in 315 B.C. For thousands of years, chrysocolla has been known throughout the world as a stone of calming reconciliation and reassurance. In ancient Egypt, it was called the "wise stone" because it shielded and encouraged the mind during negotiations.