Foitite and Common Opal Physical Properties

Foitite and Common Opal Chemical Formula

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

• Chemical formula of Foitite- Na x[Fe2+2(Al,Fe3+ )]Al 6(BO 3) 3Si 6O 18(OH) 4Anthony et al , Handbook of mineralogy (2001)
• Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

Foitite and Common Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Foitite and Common Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Foitite and Common Opal Optical Properties during the identification of gemstone. Specific gravity of Foitite is 1.98-2.50 whereas that of Common Opal is 1.98-2.50.