Know all about Shale and Marl properties here. All properties of rocks are important as they define the type of rock and its application. Shale and Marl belong to Sedimentary Rocks.Texture of Shale is Clastic, Splintery whereas that of Marl is Earthy. Shale appears Muddy and Marl appears Rough and Dull. The luster of Shale and Marl is dull. Shale is available in black, brown, buff, green, grey, red, yellow colors whereas Marl is available in beige, brown, green, grey, white colors. The commercial uses of Shale are creating artwork, pottery and that of Marl are creating artwork, soil conditioner.