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