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