Chrysopal is a green variety of opal.The green color is usually due to the Ni ions contained in the opal. The hue is predominantly apple green, due to which it can be confused with chrysoprase. It is an inexpensive ornamental stone used in jewelry.
You can see chrysopal stone for sale and buy it in the Minerals of Russia online store.
A variety of Opal: Green nickeloan variety of Opal transitive to Chrysoprase.