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