Chrysocolla:

Chemical: (Cu,Al)2H2Si2O5(OH)4.H2O (Hydrous copper silicate)

Chrysocolla is colored bright green, blue, to bluish green. Chrysocolla has a microcrystalline structure, which means a crystallized mineral or rock that contains crystals that can only be seen through a microscope. It is a semi hard mineral with a hardness of 2 to 4 and is soft, fragile, and very light in weight. It can be translucent to opaque with a glassy to greasy like luster.

Chrysocolla can become agatized making it useful for jewelry making, carving, polishing, and such. It can also be found as Druzy Chrysocolla. This is Chrysocolla that has been agatized with the formation of sparkling crystals found in small cavities.

Chrysocolla can look much like the more precious stone turquoise and can be passed off as a fraudulent substitute by unscrupulous people.