Know all about Oil shale and Rhomb Porphyry properties here. All properties of rocks are important as they define the type of rock and its application. Oil shale belongs to Sedimentary Rocks while Rhomb Porphyry belongs to Igneous Rocks.Texture of Oil shale is Splintery whereas that of Rhomb Porphyry is Aphanitic to Porphyritic. Oil shale appears Muddy and Rhomb Porphyry appears Rough. The luster of Oil shale is dull while that of Rhomb Porphyry is subvitreous to dull. Oil shale is available in black, brown, buff, green, grey, red, yellow colors whereas Rhomb Porphyry is available in black, brown, colourless, green, grey, pink, white colors. The commercial uses of Oil shale are an oil and gas reservoir 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).