While comparing Emerald and Willemite 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 Emerald and Willemite chemical formula.
Another important criteria for qualitative analysis of gemstones is Emerald and Willemite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Emerald and Willemite Optical Properties during the identification of gemstone. Specific gravity of Emerald is 3.89-4.18 whereas that of Willemite is 3.89-4.18.
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