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