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