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