Australia, Canada, Guatemala, Italy, Kenya, Mexico, Turkey, Mexico, Guatemala, Mexico, Guatemala
Australia, Southern and central Africa, green, brown, Australia, France, green, brown, Australia, France
Brown, Green
Green, Colorless, gray, Yellow, White
Conchoidal, ConchoidalWalter Schumann, Conchoidal
Uneven, Yellow, White, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic