Know all about Marl and Icelandite properties here. All properties of rocks are important as they define the type of rock and its application. Marl belongs to Sedimentary Rocks while Icelandite belongs to Igneous Rocks.Texture of Marl is Earthy whereas that of Icelandite is Aphanitic to Porphyritic. Marl appears Rough and Dull and Icelandite appears Dull and Soft. The luster of Marl is dull while that of Icelandite is vitreous. Marl is available in beige, brown, green, grey, white colors whereas Icelandite is available in bluish - grey, grey, pink, yellow colors. The commercial uses of Marl are creating artwork, soil conditioner and that of Icelandite are cemetery markers, creating artwork.