Alexandrite and Opal Physical Properties

Alexandrite and Opal Chemical Formula

While comparing Alexandrite and Opal 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 Alexandrite and Opal chemical formula.

• Chemical formula of Alexandrite- BeAl ₂ O ₄
• Chemical formula of Opal- SiO₂ · nH₂O

Alexandrite and Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Opal Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 1.98-2.25 whereas that of Opal is 1.98-2.25.