Onyx and Polyhalite Physical Properties

Onyx and Polyhalite Chemical Formula

While comparing Onyx and Polyhalite 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 Polyhalite chemical formula.

• Chemical formula of Onyx- SiO₂
• Chemical formula of Polyhalite- K2Ca2Mg(SO4)4·2H2O

Onyx and Polyhalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Polyhalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Polyhalite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.78 whereas that of Polyhalite is 2.78.