Foitite and Spinel Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
none
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.17
  
3.64-3.66
  
Fracture
Handbook of mineralogy (2001)
  
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
  
Cleavage
None
  
None, but may exhibit slight parting
  
Mohs Hardness
7
  
8
  
Chemical Composition
Na x[Fe2+2(Al,Fe3+ )]Al 6(BO 3) 3Si 6O 18(OH) 4Anthony et al , Handbook of mineralogy (2001)
  
MgAl2O4
  
Foitite and Spinel Chemical Formula
While comparing Foitite 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 Foitite and Spinel chemical formula.
- Chemical formula of Foitite- Na x[Fe2+2(Al,Fe3+ )]Al 6(BO 3) 3Si 6O 18(OH) 4Anthony et al , Handbook of mineralogy (2001)
- Chemical formula of Spinel- MgAl2O4
Foitite and Spinel Specific Gravity
Another important criteria for qualitative analysis of gemstones is Foitite and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Foitite and Spinel Optical Properties during the identification of gemstone. Specific gravity of Foitite is 3.64-3.66 whereas that of Spinel is 3.64-3.66.