Know all about Variolite and Argillite properties here. All properties of rocks are important as they define the type of rock and its application. Variolite belongs to Igneous Rocks while Argillite belongs to Sedimentary Rocks.Texture of Variolite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular whereas that of Argillite is Clastic, Polished. Variolite appears Dull and Soft and Argillite appears Rough and Dull. The luster of Variolite is not available while that of Argillite is waxy and dull. Variolite is available in black, brown, light to dark grey colors whereas Argillite is available in dark grey to black, pink, red, white colors. The commercial uses of Variolite are cemetery markers, creating artwork and that of Argillite are fire resistant, used to manufracture paperweights and bookends.