While comparing Achroite and Pyrophyllite 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 Pyrophyllite chemical formula.
Another important criteria for qualitative analysis of gemstones is Achroite and Pyrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Pyrophyllite Optical Properties during the identification of gemstone. Specific gravity of Achroite is 2.65-2.90 whereas that of Pyrophyllite is 2.65-2.90.
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