Smoky Quartz and Corundum Physical Properties
Tenacity
Brittle
  
Brittle
  
Solubility
Not Available
  
insoluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.65
  
3.90-4.05
  
Fracture
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
  
Uneven, Uneven, Gems, Difficult, Fibrous
  
Cleavage
{0110} Indistinct
  
None – parting in 3 directions
  
Mohs Hardness
7
  
9
  
Chemical Composition
SiO2
  
Al 2O 3Arthur Thomas , Gemstones (2009)
  
Smoky Quartz and Corundum Chemical Formula
While comparing Smoky Quartz 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 Smoky Quartz and Corundum chemical formula.
- Chemical formula of Smoky Quartz- SiO2
- Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
Smoky Quartz and Corundum Specific Gravity
Another important criteria for qualitative analysis of gemstones is Smoky Quartz and Corundum Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Smoky Quartz and Corundum Optical Properties during the identification of gemstone. Specific gravity of Smoky Quartz is 3.90-4.05 whereas that of Corundum is 3.90-4.05.