USA, Southern and central Africa, green, blue, China, India, USA, Italy, green, blue, China, India, USA, Italy
Southern and central Africa, Vietnam
Uneven, Uneven, Gemstones of the world (2001) More from other references
Splintery, Brittle, Uneven
H 4Mg 3Si 2O 9Walter Schumann , Gemstones of the world (2001) More from other references
NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)