1 Physical Properties
1.1 Tenacity
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1.2 Solubility
Not Available
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1.3 Durability
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1.4 Specific Gravity
2.50-3.003.77-3.93
1
7.18
3.8 Fracture
Uneven-Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
Gems, Conchoidal, Brittle
3.9 Cleavage
3.10 Mohs Hardness
3.11 Chemical Composition
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4
Ca 3Ti4+2(Fe3+2Si)O 12Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references