Lazurite and Petalite Physical Properties
Solubility
Soluble
insoluble
Durability
Not Available
Not Available
Specific Gravity
2.75
2.40
Fracture
Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal
Cleavage
Imperfect on {110}
Perfect on {001}, poor on {201} with 38.5° angle between the two
Chemical Composition
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Lazurite and Petalite Chemical Formula
While comparing Lazurite and Petalite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Lazurite and Petalite chemical formula.
- Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
- Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Lazurite and Petalite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Lazurite and Petalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lazurite and Petalite Optical Properties during the identification of gemstone. Specific gravity of Lazurite is 2.40 whereas that of Petalite is 2.40.