Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.212.50-3.00
1
7.18
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Fracture
-
Uneven-Conchoidal, ConchoidalWalter Schumann
Cleavage
None
3,6
Mohs Hardness
7-7.55.5
2
10
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Chemical Composition
(Al,Mn3+ ) 2SiO 4OGemdat.org , Management Team (2012)
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4