White Opal and Corundum Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Not Available
  
insoluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
1.98-2.50
  
3.90-4.05
  
Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001)
  
Uneven, Uneven, Gems, Difficult, Fibrous
  
Cleavage
Not Available
  
None – parting in 3 directions
  
Mohs Hardness
5.5-6.5
  
9
  
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
  
Al 2O 3Arthur Thomas , Gemstones (2009)
  
White Opal and Corundum Chemical Formula
While comparing White Opal and Corundum 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 White Opal and Corundum chemical formula.
- Chemical formula of White Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
- Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
White Opal and Corundum Specific Gravity
Another important criteria for qualitative analysis of gemstones is White Opal and Corundum Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use White Opal and Corundum Optical Properties during the identification of gemstone. Specific gravity of White Opal is 3.90-4.05 whereas that of Corundum is 3.90-4.05.