Southern and central Africa, Orange, blue, Orange, blue
USA, Southern and central Africa, green, blue, China, India, USA, Italy, green, blue, China, India, USA, Italy
Irregular, Irregular, Gemstones of the world (2001)
Uneven, Uneven, Gemstones of the world (2001) More from other references
CaCO 3Ulrich Henn and Claudio C.
H 4Mg 3Si 2O 9Walter Schumann , Gemstones of the world (2001) More from other references