Apophyllite and Onyx Physical Properties

Apophyllite and Onyx Chemical Formula

While comparing Apophyllite 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 Apophyllite and Onyx chemical formula.

• Chemical formula of Apophyllite- KCa 4Si 8O 20(F,OH) · 8H 2OUlrich Henn and Claudio C.
• Chemical formula of Onyx- SiO₂

Apophyllite and Onyx Specific Gravity

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