Spinel and Amethyst Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
none
  
insoluble in common solvents
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.64-3.66
  
2.65
  
Fracture
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
  
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
  
Cleavage
None, but may exhibit slight parting
  
Indiscernible
  
Mohs Hardness
8
  
7
  
Chemical Composition
MgAl2O4
  
SiO2
  
Spinel and Amethyst Chemical Formula
While comparing Spinel and Amethyst 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 Spinel and Amethyst chemical formula.
- Chemical formula of Spinel- MgAl2O4
- Chemical formula of Amethyst- SiO2
Spinel and Amethyst Specific Gravity
Another important criteria for qualitative analysis of gemstones is Spinel and Amethyst Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Spinel and Amethyst Optical Properties during the identification of gemstone. Specific gravity of Spinel is 2.65 whereas that of Amethyst is 2.65.