Know all about Marl and Rhomb Porphyry properties here. All properties of rocks are important as they define the type of rock and its application. Marl belongs to Sedimentary Rocks while Rhomb Porphyry belongs to Igneous Rocks.Texture of Marl is Earthy whereas that of Rhomb Porphyry is Aphanitic to Porphyritic. Marl appears Rough and Dull and Rhomb Porphyry appears Rough. The luster of Marl is dull while that of Rhomb Porphyry is subvitreous to dull. Marl is available in beige, brown, green, grey, white colors whereas Rhomb Porphyry is available in black, brown, colourless, green, grey, pink, white colors. The commercial uses of Marl are creating artwork, soil conditioner and that of Rhomb Porphyry are an oil and gas reservoir, as a feed additive for livestock, metallurgical flux, soil conditioner, source of magnesia (mgo).