Petalite and Emerald Physical Properties
Tenacity
Brittle
Not Available
Solubility
insoluble
Not Available
Durability
Not Available
Hard
Specific Gravity
2.40
2.67-2.78
Fracture
Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
Cleavage
Perfect on {001}, poor on {201} with 38.5° angle between the two
Imperfect on the [0001]
Mohs Hardness
6-6.5
7.5-8
Chemical Composition
LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Be3Al2SiO6
Petalite and Emerald Chemical Formula
While comparing Petalite and Emerald 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 Emerald chemical formula.
- Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
- Chemical formula of Emerald- Be3Al2SiO6
Petalite and Emerald Specific Gravity
Another important criteria for qualitative analysis of gemstones is Petalite and Emerald Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Petalite and Emerald Optical Properties during the identification of gemstone. Specific gravity of Petalite is 2.67-2.78 whereas that of Emerald is 2.67-2.78.