Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.50-3.004.95-5.0
1
7.18
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Fracture
Uneven-Conchoidal, ConchoidalWalter Schumann
Uneven
Cleavage
3,6
Imperfect to indistinct on {10 1 0}, parting on {0001}
Mohs Hardness
5.54-5
2
10
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Chemical Composition
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4
(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references