Know all about Oil shale and Marl properties here. All properties of rocks are important as they define the type of rock and its application. Oil shale and Marl belong to Sedimentary Rocks.Texture of Oil shale is Splintery whereas that of Marl is Earthy. Oil shale appears Muddy and Marl appears Rough and Dull. The luster of Oil shale and Marl is dull. Oil 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 Oil shale are an oil and gas reservoir and that of Marl are creating artwork, soil conditioner.