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