Uneven, Uneven, Gemstones of the world (2001) More from other references
Uneven-Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
H 4Mg 3Si 2O 9Walter Schumann , Gemstones of the world (2001) More from other references
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4