Willemite and Opal Physical Properties

Willemite and Opal Chemical Formula

While comparing Willemite 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 Willemite and Opal chemical formula.

• Chemical formula of Willemite- Zn 2SiO 4Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
• Chemical formula of Opal- SiO₂ · nH₂O

Willemite and Opal Specific Gravity

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