Canada, Madagascar, Southern and central Africa, Sri Lanka, USA
Afghanistan, Pakistan, Burma, Brazil, Madagascar, USA, Canada, Russia, Madagascar, Brazil, Canada, Mexico, Madagascar, Brazil, Canada, Mexico
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
Gemstones of the world (2001), UnevenWalter Schumann, Gemstones of the world (2001)
Strong trichroism: colorless to yellowish
Strong trichroism: colorless pink violetHerve Nicolas Lazzarelli