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