Tanzania, Kenya, Madagascar, Cambodia, Sri Lanka, Burma, Thailand, Vietnam, Australia
Ethiopia, Mexico, Honduras, Guatemala, Brazil, USA, Canada, Madagascar, Tanzania, Czech, Slovakia
Blue, Green, Yellow, Brown, White, Colorless, Red, pink, Reddish, gray
Black, Red
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
Not Available