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