Andean Opal and Sard Chemical Formula
While comparing Andean 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 Andean Opal and Sard chemical formula.
>- Chemical formula of Sard- SiO 2Ulrich Henn and Claudio C.