Corundum and Andesine Physical Properties
Tenacity
Brittle
  
Brittle
  
Solubility
insoluble
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.90-4.05
  
2.65-2.69
  
Fracture
Uneven, Uneven, Gems, Difficult, Fibrous
  
Uneven, Uneven, Conchoidal, Uneven, Gems, Sixth Edition (2006)
  
Cleavage
None – parting in 3 directions
  
Perfect on {001}, good on {010}
  
Mohs Hardness
9
  
6-6.5
  
Chemical Composition
Al 2O 3Arthur Thomas , Gemstones (2009)
  
(Na,Ca)Al1-2Si3-2O8
  
Corundum and Andesine Chemical Formula
While comparing Corundum and Andesine 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 Corundum and Andesine chemical formula.
- Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
- Chemical formula of Andesine- (Na,Ca)Al1-2Si3-2O8
Corundum and Andesine Specific Gravity
Another important criteria for qualitative analysis of gemstones is Corundum and Andesine Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Corundum and Andesine Optical Properties during the identification of gemstone. Specific gravity of Corundum is 2.65-2.69 whereas that of Andesine is 2.65-2.69.