While comparing Milk Opal and Amethyst 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 Milk Opal and Amethyst chemical formula.
Another important criteria for qualitative analysis of gemstones is Milk Opal and Amethyst Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Milk Opal and Amethyst Optical Properties during the identification of gemstone. Specific gravity of Milk Opal is 2.65 whereas that of Amethyst is 2.65.
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