Know all about Trachyandesite and Obsidian properties here. All properties of rocks are important as they define the type of rock and its application. Trachyandesite and Obsidian belong to Igneous Rocks.Texture of Trachyandesite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular whereas that of Obsidian is Glassy. Trachyandesite appears Dull and Soft and Obsidian appears Shiny. The luster of Trachyandesite is earthy while that of Obsidian is vitreous. Trachyandesite is available in black, brown, light to dark grey colors whereas Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors. The commercial uses of Trachyandesite are creating artwork, pottery and that of Obsidian are creating artwork, mirror, used in aquariums.