Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.70-3.902.50-3.00
1
7.18
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Fracture
Conchoidal
Uneven-Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect on {011}, fair on {100}, poor on {110}
3,6
Mohs Hardness
3.5-45.5
2
10
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Chemical Composition
Cu 3(OH) 2(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4