The chrysoprase is an apple-green chalcedony, sometimes olive- or
whitish-green. It is translucent, scratches glass, and has the specific
gravity of 2.56.
The color is due to the presence of oxide of nickel. This stone is
found principally in Silesia, but also in Siberia and the United States.
Large pieces of chrysoprase are rare, and even the best specimens lose
their color in course of time.