Know all about Gneiss and Marl properties here. All properties of rocks are important as they define the type of rock and its application. Gneiss belongs to Metamorphic Rocks while Marl belongs to Sedimentary Rocks.Texture of Gneiss is Banded, Foliated, Platy whereas that of Marl is Earthy. Gneiss appears Foliated and Marl appears Rough and Dull. The luster of Gneiss and Marl is dull. Gneiss is available in black, brown, pink, red, white colors whereas Marl is available in beige, brown, green, grey, white colors. The commercial uses of Gneiss are cemetery markers, jewelry, tombstones, used in aquariums and that of Marl are creating artwork, soil conditioner.