Malachite and Corundum Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Not Available
  
insoluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.25-4.10
  
3.90-4.05
  
Fracture
Conchoidal, Conchoidal, Gemstones (2009), Uneven
  
Uneven, Uneven, Gems, Difficult, Fibrous
  
Cleavage
Perfect on { 2 01} fair on {010}
  
None – parting in 3 directions
  
Mohs Hardness
3.5-4
  
9
  
Chemical Composition
Cu2CO3(OH)2
  
Al 2O 3Arthur Thomas , Gemstones (2009)
  
Malachite and Corundum Chemical Formula
While comparing Malachite 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 Malachite and Corundum chemical formula.
- Chemical formula of Malachite- Cu2CO3(OH)2
- Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
Malachite and Corundum Specific Gravity
Another important criteria for qualitative analysis of gemstones is Malachite and Corundum Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Malachite and Corundum Optical Properties during the identification of gemstone. Specific gravity of Malachite is 3.90-4.05 whereas that of Corundum is 3.90-4.05.