Know all about Icelandite and Coal properties here. All properties of rocks are important as they define the type of rock and its application. Icelandite belongs to Igneous Rocks while Coal belongs to Sedimentary Rocks.Texture of Icelandite is Aphanitic to Porphyritic whereas that of Coal is Amorphous, Glassy. Icelandite appears Dull and Soft and Coal appears Veined or Pebbled. The luster of Icelandite is vitreous while that of Coal is dull to vitreous to submetallic. Icelandite is available in bluish - grey, grey, pink, yellow colors whereas Coal is available in black, brown, dark brown, grey, light to dark grey colors. The commercial uses of Icelandite are cemetery markers, creating artwork and that of Coal are alumina refineries, electricity generation, liquid fuel, manufacture of soap, solvents, dyes, plastics and fibres, paper industry.