Chrysoprase semi-flat stones (flat stones) from Queensland-Australia

Chrysoprase (Greek: chrysos, gold and prason, leek) is a variety of the mineral chalcedony, that shares the chemical, optical and physical properties. It may contain small amounts of nickel and has a color which can vary from apple green to deep green. Chrysoprase is often used as a gemstone. Chrysoprase is mined in Australia (Queensland and Western Australia), Germany, Poland, Russia, the United States (in the states of Arizona and California), and Brazil.