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