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