Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)