Material identified as Chrysocolla may be a mixture of the copper hydroxide spertiniite and chalcedony. There are various names for the beautiful stone, which can range from blues to greens, or in some cases, such as Parrot wing chrysocolla, can be a myriad of vivid beautiful colors all in one stone. Chrysocolla can also be mixed in with Azurite and Cuprite, all of which share the copper minerals.
A large amount of the Chrysocollas used in jewelry today, which can include parrot wing chrysocolla, gem silica and just "plain" old chrysocolla comes from Mexico and the Southwestern United States. Arizona and Nevada are known far and near for the many beautiful varieties of this hard to find high quality stone.