Know all about Argillite and Icelandite properties here. All properties of rocks are important as they define the type of rock and its application. Argillite belongs to Sedimentary Rocks while Icelandite belongs to Igneous Rocks.Texture of Argillite is Clastic, Polished whereas that of Icelandite is Aphanitic to Porphyritic. Argillite appears Rough and Dull and Icelandite appears Dull and Soft. The luster of Argillite is waxy and dull while that of Icelandite is vitreous. Argillite is available in dark grey to black, pink, red, white colors whereas Icelandite is available in bluish - grey, grey, pink, yellow colors. The commercial uses of Argillite are fire resistant, used to manufracture paperweights and bookends and that of Icelandite are cemetery markers, creating artwork.