Crystal Lapis Lazuli

Chemical Formula	The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4
Color	Blue, Multicolored
Hardness	5 - 5.5
Crystal System	Isometric
Refractive Index	1.5
SG	2.4 - 2.5
Transparency	Opaque
Double Refraction	None
Luster	Vitreous to greasy
Cleavage	3,6
Mineral Class	Rock that is mostly Lazurite with minor Calcite, Pyrite, and other minerals