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