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