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