While comparing Lavrovite and Feldspar 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 Lavrovite and Feldspar chemical formula.
Another important criteria for qualitative analysis of gemstones is Lavrovite and Feldspar Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lavrovite and Feldspar Optical Properties during the identification of gemstone. Specific gravity of Lavrovite is 2.56-2.75 whereas that of Feldspar is 2.56-2.75.