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