Onyx and Malachite Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.55-2.70
  
3.25-4.10
  
Fracture
Not Available
  
Conchoidal, Conchoidal, Gemstones (2009), Uneven
  
Cleavage
Indiscernible
  
Perfect on { 2 01} fair on {010}
  
Mohs Hardness
6.5-7
  
3.5-4
  
Chemical Composition
SiO2
  
Cu2CO3(OH)2
  
Onyx and Malachite Chemical Formula
While comparing Onyx and Malachite 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 Onyx and Malachite chemical formula.
- Chemical formula of Onyx- SiO2
- Chemical formula of Malachite- Cu2CO3(OH)2
Onyx and Malachite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Onyx and Malachite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Malachite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 3.25-4.10 whereas that of Malachite is 3.25-4.10.