Know all about Argillite and Ijolite properties here. All properties of rocks are important as they define the type of rock and its application. Argillite belongs to Sedimentary Rocks while Ijolite belongs to Igneous Rocks.Texture of Argillite is Clastic, Polished whereas that of Ijolite is Earthy, Granular. Argillite appears Rough and Dull and Ijolite appears Banded and Foilated. The luster of Argillite is waxy and dull while that of Ijolite is greasy to dull. Argillite is available in dark grey to black, pink, red, white colors whereas Ijolite is available in brown, buff, cream, green, grey, pink, white colors. The commercial uses of Argillite are fire resistant, used to manufracture paperweights and bookends and that of Ijolite are cemetery markers, creating artwork.