Know all about Chert and Icelandite properties here. All properties of rocks are important as they define the type of rock and its application. Chert belongs to Sedimentary Rocks while Icelandite belongs to Igneous Rocks.Texture of Chert is Banded, Rough whereas that of Icelandite is Aphanitic to Porphyritic. Chert appears Glassy or Pearly and Icelandite appears Dull and Soft. The luster of Chert is waxy and dull while that of Icelandite is vitreous. Chert is available in black, brown, green, grey, red, white colors whereas Icelandite is available in bluish - grey, grey, pink, yellow colors. The commercial uses of Chert are creating artwork, gemstone, in fire-starting tools, jewelry, to ignite fire, used in flintlock firearms and that of Icelandite are cemetery markers, creating artwork.