Alexandrite and Chalcedony Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.69-3.81
  
2.55-2.70
  
Fracture
Not Available
  
Uneven, Splintery, Conchoidal, Uneven, Splintery, Conchoidal, UnevenWalter Schumann
  
Cleavage
1,1 ; 3,2.
  
Absent
  
Mohs Hardness
8.5
  
6.5-7
  
Chemical Composition
BeAl 2 O 4
  
SiO2
  
Alexandrite and Chalcedony Chemical Formula
While comparing Alexandrite and Chalcedony 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 Alexandrite and Chalcedony chemical formula.
- Chemical formula of Alexandrite- BeAl 2 O 4
- Chemical formula of Chalcedony- SiO2
Alexandrite and Chalcedony Specific Gravity
Another important criteria for qualitative analysis of gemstones is Alexandrite and Chalcedony Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Chalcedony Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 2.55-2.70 whereas that of Chalcedony is 2.55-2.70.