Know all about Oil shale and Gabbro 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 Gabbro belongs to Igneous Rocks.Texture of Oil shale is Splintery whereas that of Gabbro is Phaneritic. Oil shale appears Muddy and Gabbro appears Veined and Shiny. The luster of Oil shale is dull while that of Gabbro is not available. Oil shale is available in black, brown, buff, green, grey, red, yellow colors whereas Gabbro is available in dark grey to black colors. The commercial uses of Oil shale are an oil and gas reservoir and that of Gabbro are cemetery markers, commemorative tablets, laboratory bench tops, jewelry, sea defence, tombstones.