USA, Southern and central Africa, green, blue, China, India, USA, Italy, green, blue, China, India, USA, Italy
Pakistan, Italy, Russia, China, Brazil, Switzerland, Madagascar, Austria, Canada
White, Yellow
Reddish, Brown, Yellow, Green, Red, gray
Uneven, Uneven, Gemstones of the world (2001) More from other references
Sub-Conchoidal, Conchoidal, Brittle