Know all about Marl and Rhyodacite properties here. All properties of rocks are important as they define the type of rock and its application. Marl belongs to Sedimentary Rocks while Rhyodacite belongs to Igneous Rocks.Texture of Marl is Earthy whereas that of Rhyodacite is Earthy. Marl appears Rough and Dull and Rhyodacite appears Skeletal. The luster of Marl is dull while that of Rhyodacite is greasy to dull. Marl is available in beige, brown, green, grey, white colors whereas Rhyodacite is available in black to grey, dark greenish - grey colors. The commercial uses of Marl are creating artwork, soil conditioner and that of Rhyodacite are cemetery markers, creating artwork.