Amethyst and Turquoise Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
insoluble in common solvents
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.65
  
2.30-2.90
  
Fracture
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
  
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
  
Cleavage
Indiscernible
  
Good to perfect_usually N/A
  
Mohs Hardness
7
  
5-6
  
Chemical Composition
SiO2
  
CuAl6(PO4)4(OH)8 • 4H2O
  
Amethyst and Turquoise Chemical Formula
While comparing Amethyst and Turquoise 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 Turquoise chemical formula.
- Chemical formula of Amethyst- SiO2
- Chemical formula of Turquoise- CuAl6(PO4)4(OH)8 • 4H2O
Amethyst and Turquoise Specific Gravity
Another important criteria for qualitative analysis of gemstones is Amethyst and Turquoise Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Amethyst and Turquoise Optical Properties during the identification of gemstone. Specific gravity of Amethyst is 2.30-2.90 whereas that of Turquoise is 2.30-2.90.