While comparing Sunstone and Atacamite 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 Sunstone and Atacamite chemical formula.
Another important criteria for qualitative analysis of gemstones is Sunstone and Atacamite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sunstone and Atacamite Optical Properties during the identification of gemstone. Specific gravity of Sunstone is 3.745-3.776 whereas that of Atacamite is 3.745-3.776.