While comparing Bertrandite and Pleonaste 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 Bertrandite and Pleonaste chemical formula.
Another important criteria for qualitative analysis of gemstones is Bertrandite and Pleonaste Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Bertrandite and Pleonaste Optical Properties during the identification of gemstone. Specific gravity of Bertrandite is 3.80 whereas that of Pleonaste is 3.80.