1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.50-3.602.50-3.00
1
7.18
1.5 Fracture
Uneven, Brittle, Metallic, Brittle, Metallic, Brittle, Metallic
Uneven-Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
1.6 Cleavage
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
3,6
1.7 Mohs Hardness
1.8 Chemical Composition
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4