Know all about Tuff and Tachylite properties here. All properties of rocks are important as they define the type of rock and its application. Tuff and Tachylite belong to Igneous Rocks.Texture of Tuff is Clastic, Pyroclastic whereas that of Tachylite is Vitreous. Tuff appears Dull, Vesicular and Foilated and Tachylite appears Glassy. The luster of Tuff is vitreous to dull while that of Tachylite is resinous. Tuff is available in brown, grey, yellow colors whereas Tachylite is available in black, dark brown colors. The commercial uses of Tuff are creating artwork and that of Tachylite are cemetery markers, creating artwork.