Know all about Icelandite and Itacolumite properties here. All properties of rocks are important as they define the type of rock and its application. Icelandite belongs to Igneous Rocks while Itacolumite belongs to Sedimentary Rocks.Texture of Icelandite is Aphanitic to Porphyritic whereas that of Itacolumite is Clastic, Granular, Rough. Icelandite appears Dull and Soft and Itacolumite appears Rough. The luster of Icelandite is vitreous while that of Itacolumite is dull. Icelandite is available in bluish - grey, grey, pink, yellow colors whereas Itacolumite is available in beige, black, brown, colourless, cream, dark brown, green, grey, light green, light to dark grey, pink, red, white, yellow colors. The commercial uses of Icelandite are cemetery markers, creating artwork and that of Itacolumite are an oil and gas reservoir, in aquifers, petroleum reservoirs, soil conditioner, source of magnesia (mgo), tombstones.