Onyx and Azurite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.55-2.70
3.70-3.90
Fracture
Not Available
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Cleavage
Indiscernible
Perfect on {011}, fair on {100}, poor on {110}
Mohs Hardness
6.5-7
3.5-4
Chemical Composition
SiO2
Cu 3(OH) 2(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Onyx and Azurite Chemical Formula
While comparing Onyx and Azurite 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 Azurite chemical formula.
- Chemical formula of Onyx- SiO2
- Chemical formula of Azurite- Cu 3(OH) 2(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Onyx and Azurite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Onyx and Azurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Azurite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 3.70-3.90 whereas that of Azurite is 3.70-3.90.