Cordierite Iolite and Onyx Physical Properties

Cordierite Iolite and Onyx Chemical Formula

While comparing Cordierite Iolite 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 Cordierite Iolite and Onyx chemical formula.

• Chemical formula of Cordierite Iolite- Mg 2Al 4Si 5O 18Ulrich Henn and Claudio C.
• Chemical formula of Onyx- SiO₂

Cordierite Iolite and Onyx Specific Gravity

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