Petalite and Labradorite Physical Properties
Tenacity
Brittle
Not Available
Solubility
insoluble
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.40
2.69-2.72
Fracture
Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal
Uneven, Conchoidal, Gems, Sixth Edition (2006)
Cleavage
Perfect on {001}, poor on {201} with 38.5° angle between the two
Perfect on {001}, less perfect on {010}, intersecting at near 90°; distinct on {110}
Mohs Hardness
6-6.5
6-6.5
Chemical Composition
LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Na,Ca)1-2Si3-2O8
Petalite and Labradorite Chemical Formula
While comparing Petalite and Labradorite 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 Labradorite chemical formula.
- Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
- Chemical formula of Labradorite- (Na,Ca)1-2Si3-2O8
Petalite and Labradorite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Petalite and Labradorite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Petalite and Labradorite Optical Properties during the identification of gemstone. Specific gravity of Petalite is 2.69-2.72 whereas that of Labradorite is 2.69-2.72.