Know all about Marl and Tachylite properties here. All properties of rocks are important as they define the type of rock and its application. Marl belongs to Sedimentary Rocks while Tachylite belongs to Igneous Rocks.Texture of Marl is Earthy whereas that of Tachylite is Vitreous. Marl appears Rough and Dull and Tachylite appears Glassy. The luster of Marl is dull while that of Tachylite is resinous. Marl is available in beige, brown, green, grey, white colors whereas Tachylite is available in black, dark brown colors. The commercial uses of Marl are creating artwork, soil conditioner and that of Tachylite are cemetery markers, creating artwork.