Spinel and Ajoite Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
none
  
Decomposed by acids
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.64-3.66
  
2.96
  
Fracture
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
  
Not Available
  
Cleavage
None, but may exhibit slight parting
  
Perfect on {010}
  
Mohs Hardness
8
  
5
  
Chemical Composition
MgAl2O4
  
(K,Na)3Cu20Al3Si29O76(OH)16•~8(H2O)
  
Spinel and Ajoite Chemical Formula
While comparing Spinel and Ajoite 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 Ajoite chemical formula.
- Chemical formula of Spinel- MgAl2O4
- Chemical formula of Ajoite- (K,Na)3Cu20Al3Si29O76(OH)16•~8(H2O)
Spinel and Ajoite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Spinel and Ajoite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Spinel and Ajoite Optical Properties during the identification of gemstone. Specific gravity of Spinel is 2.96 whereas that of Ajoite is 2.96.