Rock Crystal and Opal Physical Properties

Rock Crystal and Opal Chemical Formula

While comparing Rock Crystal 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 Rock Crystal and Opal chemical formula.

• Chemical formula of Rock Crystal- SiO 2Walter Schumann , Gemstones of the world (2001)
• Chemical formula of Opal- SiO₂ · nH₂O

Rock Crystal and Opal Specific Gravity

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