Sapphire and Andalusite Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
insoluble
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.95-4.03
  
3.05-3.21
  
Fracture
Uneven, Uneven, Gems, Sixth Edition (2006)
  
Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)
  
Cleavage
None, but may exhibit parting
  
Good on {110}, poor on {100}
  
Mohs Hardness
9
  
7.5
  
Chemical Composition
Al 2 O 3
  
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
  
Sapphire and Andalusite Chemical Formula
While comparing Sapphire and Andalusite 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 Sapphire and Andalusite chemical formula.
- Chemical formula of Sapphire- Al 2 O 3
- Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Sapphire and Andalusite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Sapphire and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sapphire and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Sapphire is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.
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