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