While comparing Alexandrite and Prase 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 Alexandrite and Prase chemical formula.
Another important criteria for qualitative analysis of gemstones is Alexandrite and Prase Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Prase Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 2.64-2.69 whereas that of Prase is 2.64-2.69.
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