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