USA, Southern and central Africa, green, blue, China, India, USA, Italy, green, blue, China, India, USA, Italy
Colombia, Southern and central Africa
H 4Mg 3Si 2O 9Walter Schumann , Gemstones of the world (2001) More from other references
Ca(Nd,Ce,La) 2(CO 3) 3F 2Ulrich Henn and Claudio C.