Know all about Marl and Theralite properties here. All properties of rocks are important as they define the type of rock and its application. Marl belongs to Sedimentary Rocks while Theralite belongs to Igneous Rocks.Texture of Marl is Earthy whereas that of Theralite is Phaneritic. Marl appears Rough and Dull and Theralite appears Veined and Shiny. The luster of Marl is dull while that of Theralite is waxy and dull. Marl is available in beige, brown, green, grey, white colors whereas Theralite is available in dark grey to black colors. The commercial uses of Marl are creating artwork, soil conditioner and that of Theralite are cemetery markers, commemorative tablets, creating artwork, laboratory bench tops, jewelry, sea defence, tombstones.