Opal and Boulder Opal Physical Properties

Opal and Boulder Opal Chemical Formula

While comparing Opal and Boulder 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 Opal and Boulder Opal chemical formula.

• Chemical formula of Opal- SiO₂ · nH₂O
• Chemical formula of Boulder Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

Opal and Boulder Opal Specific Gravity

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