Know all about Oil shale and Tachylite 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 Tachylite belongs to Igneous Rocks.Texture of Oil shale is Splintery whereas that of Tachylite is Vitreous. Oil shale appears Muddy and Tachylite appears Glassy. The luster of Oil shale is dull while that of Tachylite is resinous. Oil shale is available in black, brown, buff, green, grey, red, yellow colors whereas Tachylite is available in black, dark brown colors. The commercial uses of Oil shale are an oil and gas reservoir and that of Tachylite are cemetery markers, creating artwork.