Precious Opal and Alexandrite Physical Properties

Precious Opal and Alexandrite Chemical Formula

While comparing Precious Opal and Alexandrite 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 Precious Opal and Alexandrite chemical formula.

• Chemical formula of Precious Opal- SiO 2 · nH 2OGemdat.org , Management Team (2012)
• Chemical formula of Alexandrite- BeAl ₂ O ₄

Precious Opal and Alexandrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Precious Opal and Alexandrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Precious Opal and Alexandrite Optical Properties during the identification of gemstone. Specific gravity of Precious Opal is 3.69-3.81 whereas that of Alexandrite is 3.69-3.81.