Characteristics related to grain size of rocks are called as texture. Here you can know more about texture of Rapakivi Granite and Oil shale. Texture of Rapakivi Granite is Granular, Phaneritic whereas that of Oil shale is Splintery. Based on the texture of rocks, they are used for various purposes. Get detailed information about Rapakivi Granite vs Oil shale texture, color, appearance and maintenance in the next section.