Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.50-3.003.65-4.55
1
7.18
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Fracture
Uneven-Conchoidal, ConchoidalWalter Schumann
Conchoidal
Cleavage
3,6
None, but may exhibit slight parting
Mohs Hardness
5.57.5-8
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
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)