Know all about Trachyandesite and Tachylite properties here. All properties of rocks are important as they define the type of rock and its application. Trachyandesite and Tachylite belong to Igneous Rocks.Texture of Trachyandesite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular whereas that of Tachylite is Vitreous. Trachyandesite appears Dull and Soft and Tachylite appears Glassy. The luster of Trachyandesite is earthy while that of Tachylite is resinous. Trachyandesite is available in black, brown, light to dark grey colors whereas Tachylite is available in black, dark brown colors. The commercial uses of Trachyandesite are creating artwork, pottery and that of Tachylite are cemetery markers, creating artwork.