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