While comparing Apophyllite KF and Selenite 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 Apophyllite KF and Selenite chemical formula.
Another important criteria for qualitative analysis of gemstones is Apophyllite KF and Selenite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Apophyllite KF and Selenite Optical Properties during the identification of gemstone. Specific gravity of Apophyllite KF is Not Available whereas that of Selenite is Not Available.