Amethyst and Sardonyx Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
insoluble in common solvents
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.65
  
2.55-2.70
  
Fracture
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
  
Not Available
  
Cleavage
Indiscernible
  
Not Available
  
Mohs Hardness
7
  
6.5-7
  
Chemical Composition
SiO2
  
SiO 2Ulrich Henn and Claudio C.
  
Amethyst and Sardonyx Chemical Formula
While comparing Amethyst and Sardonyx 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 Amethyst and Sardonyx chemical formula.
- Chemical formula of Amethyst- SiO2
- Chemical formula of Sardonyx- SiO 2Ulrich Henn and Claudio C.
Amethyst and Sardonyx Specific Gravity
Another important criteria for qualitative analysis of gemstones is Amethyst and Sardonyx Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Amethyst and Sardonyx Optical Properties during the identification of gemstone. Specific gravity of Amethyst is 2.55-2.70 whereas that of Sardonyx is 2.55-2.70.