Andean Opal and Rock Crystal Chemical Formula
While comparing Andean Opal and Rock Crystal 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 Andean Opal and Rock Crystal chemical formula.
>- Chemical formula of Rock Crystal- SiO 2Walter Schumann , Gemstones of the world (2001)