Topaz and Petalite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
insoluble
Durability
Not Available
Not Available
Specific Gravity
3.49-3.57
2.40
Fracture
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal
Cleavage
[001] Perfect
Perfect on {001}, poor on {201} with 38.5° angle between the two
Chemical Composition
Al2SiO4(F,OH)2
LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Topaz and Petalite Chemical Formula
While comparing Topaz 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 Topaz and Petalite chemical formula.
- Chemical formula of Topaz- Al2SiO4(F,OH)2
- Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Topaz and Petalite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Topaz and Petalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz and Petalite Optical Properties during the identification of gemstone. Specific gravity of Topaz is 2.40 whereas that of Petalite is 2.40.