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