Common Opal and Sard Physical Properties

Common Opal and Sard Chemical Formula

While comparing Common Opal and Sard 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 Common Opal and Sard chemical formula.

• Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
• Chemical formula of Sard- SiO 2Ulrich Henn and Claudio C.

Common Opal and Sard Specific Gravity

Another important criteria for qualitative analysis of gemstones is Common Opal and Sard Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Common Opal and Sard Optical Properties during the identification of gemstone. Specific gravity of Common Opal is 2.58-2.63 whereas that of Sard is 2.58-2.63.