Know all about Tachylite and Shale properties here. All properties of rocks are important as they define the type of rock and its application. Tachylite belongs to Igneous Rocks while Shale belongs to Sedimentary Rocks.Texture of Tachylite is Vitreous whereas that of Shale is Clastic, Splintery. Tachylite appears Glassy and Shale appears Muddy. The luster of Tachylite is resinous while that of Shale is dull. Tachylite is available in black, dark brown colors whereas Shale is available in black, brown, buff, green, grey, red, yellow colors. The commercial uses of Tachylite are cemetery markers, creating artwork and that of Shale are creating artwork, pottery.