Afghanistan, Pakistan, Burma, Brazil, Madagascar, USA, Canada, Russia, Madagascar, Brazil, Canada, Mexico, Madagascar, Brazil, Canada, Mexico
USA, Afghanistan, Pakistan, Brazil, Madagascar
Gemstones of the world (2001), UnevenWalter Schumann, Gemstones of the world (2001)
Gemstones of the world (2001), UnevenWalter Schumann, Gemstones of the world (2001)
Strong trichroism: colorless pink violetHerve Nicolas Lazzarelli
Distinct trichroism: yellow green green blue greenHerve Nicolas Lazzarelli