Know all about Shale and Tachylite properties here. All properties of rocks are important as they define the type of rock and its application. Shale belongs to Sedimentary Rocks while Tachylite belongs to Igneous Rocks.Texture of Shale is Clastic, Splintery whereas that of Tachylite is Vitreous. Shale appears Muddy and Tachylite appears Glassy. The luster of Shale is dull while that of Tachylite is resinous. 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 Shale are creating artwork, pottery and that of Tachylite are cemetery markers, creating artwork.