Turquoise and Spinel Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Soluble
  
none
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.30-2.90
  
3.64-3.66
  
Fracture
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
  
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
  
Cleavage
Good to perfect_usually N/A
  
None, but may exhibit slight parting
  
Mohs Hardness
5-6
  
8
  
Chemical Composition
CuAl6(PO4)4(OH)8 • 4H2O
  
MgAl2O4
  
Turquoise and Spinel Chemical Formula
While comparing Turquoise and Spinel 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 Turquoise and Spinel chemical formula.
- Chemical formula of Turquoise- CuAl6(PO4)4(OH)8 • 4H2O
- Chemical formula of Spinel- MgAl2O4
Turquoise and Spinel Specific Gravity
Another important criteria for qualitative analysis of gemstones is Turquoise and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Turquoise and Spinel Optical Properties during the identification of gemstone. Specific gravity of Turquoise is 3.64-3.66 whereas that of Spinel is 3.64-3.66.