Erythrite and Spinel Physical Properties
Tenacity
Sectile
  
Not Available
  
Solubility
Not Available
  
none
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.06
  
3.64-3.66
  
Fracture
Sectile Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
  
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
  
Cleavage
Perfect on {010}; poor on {100} and { 1 02}.
  
None, but may exhibit slight parting
  
Mohs Hardness
Not Available
  
8
  
Chemical Composition
Co3(AsO4)2•8(H2O)
  
MgAl2O4
  
Erythrite and Spinel Chemical Formula
While comparing Erythrite 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 Erythrite and Spinel chemical formula.
- Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)
- Chemical formula of Spinel- MgAl2O4
Erythrite and Spinel Specific Gravity
Another important criteria for qualitative analysis of gemstones is Erythrite and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Erythrite and Spinel Optical Properties during the identification of gemstone. Specific gravity of Erythrite is 3.64-3.66 whereas that of Spinel is 3.64-3.66.