Onyx and Melanite Physical Properties

Onyx and Melanite Chemical Formula

While comparing Onyx and Melanite 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 Melanite chemical formula.

• Chemical formula of Onyx- SiO₂
• Chemical formula of Melanite- Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Onyx and Melanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Melanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Melanite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 3.70-4.10 whereas that of Melanite is 3.70-4.10.