Brazil, Kenya, Madagascar, Mozambique, Sri Lanka
Australia, Spain, Brazil, Germany, Australia, Spain, Brazil, Germany, Australia, Spain, Brazil
Conchoidal
Conchoidal, Splintery, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle
Gemmological Tables (2004)
Translucent, Opaque . May be translucent when backlit on the edges.