Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Uneven-Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
KAlSi 2O 6Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4