Schorl and Sapphire Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
insoluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.18-3.22
  
3.95-4.03
  
Fracture
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
  
Uneven, Uneven, Gems, Sixth Edition (2006)
  
Cleavage
{1011} Indistinct
  
None, but may exhibit parting
  
Mohs Hardness
Not Available
  
9
  
Chemical Composition
Na(Fe2+3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
  
Al 2 O 3
  
Schorl and Sapphire Chemical Formula
While comparing Schorl and Sapphire 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 Schorl and Sapphire chemical formula.
- Chemical formula of Schorl- Na(Fe2+3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
- Chemical formula of Sapphire- Al 2 O 3
Schorl and Sapphire Specific Gravity
Another important criteria for qualitative analysis of gemstones is Schorl and Sapphire Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Schorl and Sapphire Optical Properties during the identification of gemstone. Specific gravity of Schorl is 3.95-4.03 whereas that of Sapphire is 3.95-4.03.