Know all about Variolite and Tuff properties here. All properties of rocks are important as they define the type of rock and its application. Variolite and Tuff belong to Igneous Rocks.Texture of Variolite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular whereas that of Tuff is Clastic, Pyroclastic. Variolite appears Dull and Soft and Tuff appears Dull, Vesicular and Foilated. The luster of Variolite is not available while that of Tuff is vitreous to dull. Variolite is available in black, brown, light to dark grey colors whereas Tuff is available in brown, grey, yellow colors. The commercial uses of Variolite and Tuff are cemetery markers, creating artwork.