Know all about Marl and Variolite properties here. All properties of rocks are important as they define the type of rock and its application. Marl belongs to Sedimentary Rocks while Variolite belongs to Igneous Rocks.Texture of Marl is Earthy whereas that of Variolite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular. Marl appears Rough and Dull and Variolite appears Dull and Soft. The luster of Marl is dull while that of Variolite is not available. Marl is available in beige, brown, green, grey, white colors whereas Variolite is available in black, brown, light to dark grey colors. The commercial uses of Marl are creating artwork, soil conditioner and that of Variolite are cemetery markers, creating artwork.