Uneven, Uneven, Management Team (2012), Conchoidal, Brittle
Uneven-Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
Fe 3O 4Ulrich Henn and Claudio C.
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4