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