According to Wikipedia, Chrysocolla is a hydrated copper cyclosilicate mineral with the formula (Cu,Al)2H2Si2O5(OH)4·nH2O. Hehehe, such a convoluted scientific string! I guess that just means it’s a compound, which is apparent from the many wonderful blue/green colourways that can be seen in various pieces.
Chrysocolla is a minor ore of copper, and like malachite, has a high copper content, which is what gives it that fabulous blue/green colouring.
The name Chrysocolla derives from the Greek chrysos (gold) and kolla (glue), referring to its use as a flux in soldering gold. The term has been used since antiquity.
It is believed to have a calming influence, and also to attract love. It is supposed to help heal burns, fever, and detoxify the liver.