While comparing Amethyst and Alexandrite 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 Amethyst and Alexandrite chemical formula.
Another important criteria for qualitative analysis of gemstones is Amethyst and Alexandrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Amethyst and Alexandrite Optical Properties during the identification of gemstone. Specific gravity of Amethyst is 3.69-3.81 whereas that of Alexandrite is 3.69-3.81.
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