Know all about Marl and Troctolite properties here. All properties of rocks are important as they define the type of rock and its application. Marl belongs to Sedimentary Rocks while Troctolite belongs to Igneous Rocks.Texture of Marl is Earthy whereas that of Troctolite is Phaneritic. Marl appears Rough and Dull and Troctolite appears Veined and Shiny. The luster of Marl is dull while that of Troctolite is not available. Marl is available in beige, brown, green, grey, white colors whereas Troctolite is available in dark grey to black colors. The commercial uses of Marl are creating artwork, soil conditioner and that of Troctolite are cemetery markers, commemorative tablets, laboratory bench tops, jewelry, sea defence, tombstones.