Afghanistan, Australia, Brazil, Kenya, Southern and central Africa, Sri Lanka, Switzerland
Afghanistan, Pakistan, Burma, Brazil, Madagascar, USA, Canada, Russia, Madagascar, Brazil, Canada, Mexico, Madagascar, Brazil, Canada, Mexico
ConchoidalWalter Schumann, Gemstones of the world (2001), ConchoidalWalter Schumann, Gemstones of the world (2001)
Gemstones of the world (2001), UnevenWalter Schumann, Gemstones of the world (2001)
Green stones strong trichroism: typically colorless greenish yellow brownish to yellow;
Strong trichroism: colorless pink violetHerve Nicolas Lazzarelli