Petalite and Sodalite Physical Properties
Solubility
insoluble
Soluble
Durability
Not Available
Not Available
Specific Gravity
2.40
2.15-2.40
Fracture
Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal
Conchoidal, Uneven, UnevenArthur Thomas, Brittle
Cleavage
Perfect on {001}, poor on {201} with 38.5° angle between the two
Poor on {110}
Chemical Composition
LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na8Al6Si6O24Cl2
Petalite and Sodalite Chemical Formula
While comparing Petalite and Sodalite 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 Sodalite chemical formula.
- Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
- Chemical formula of Sodalite- Na8Al6Si6O24Cl2
Petalite and Sodalite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Petalite and Sodalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Petalite and Sodalite Optical Properties during the identification of gemstone. Specific gravity of Petalite is 2.15-2.40 whereas that of Sodalite is 2.15-2.40.