While comparing Achroite and Topaz 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 Achroite and Topaz chemical formula.
Another important criteria for qualitative analysis of gemstones is Achroite and Topaz Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Topaz Optical Properties during the identification of gemstone. Specific gravity of Achroite is 3.49-3.57 whereas that of Topaz is 3.49-3.57.
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