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