Afghanistan, Australia, Brazil, Kenya, Southern and central Africa, Sri Lanka, Switzerland
Russia, Brazil, Madagascar, USA, Russia, Brazil, Yellow, Madagascar, Namibia, USA, Russia, Brazil, Yellow, Madagascar, Namibia, USA
ConchoidalWalter Schumann, Gemstones of the world (2001), ConchoidalWalter Schumann, Gemstones of the world (2001)
Not Available