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Lapis Lazuli
Mohs scale
5.5
Specific Gravity
2.50 - 3.00
Refractive Index
1.500 - 1.670
Crystal system
Cubic
Chemical Composition
(Na,Ca)8[(SiO4,S,Cl)2I(AlSi)4]6
Sign of Zodiac (Click on the constellation for more information)