While comparing Azurmalachite and Onyx 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 Azurmalachite and Onyx chemical formula.
Another important criteria for qualitative analysis of gemstones is Azurmalachite and Onyx Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Azurmalachite and Onyx Optical Properties during the identification of gemstone. Specific gravity of Azurmalachite is 2.55-2.70 whereas that of Onyx is 2.55-2.70.