Chrysocolla rough
Chrysocolla can be thought of as a cousin to Turquoise, but much harder because it also contains silica.
Because it is hard, it takes a good polish and has very good durability.
Chrysocolla is sometimes colored pure blue, sometimes green, and sometimes a nice mixture of both blue and green. Often times in a mottled pattern.
When Chrysocolla is blue and translucent it is called Gem Silica and is priced per carat. I have a small amount of this in stock.