While comparing Ruby and Sillimanite 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 Ruby and Sillimanite chemical formula.
Another important criteria for qualitative analysis of gemstones is Ruby and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ruby and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Ruby is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.
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