Characteristics related to grain size of rocks are called as texture. Here you can know more about texture of Oolite and Obsidian. Texture of Oolite is Clastic or Non-Clastic whereas that of Obsidian is Glassy. Based on the texture of rocks, they are used for various purposes. Get detailed information about Oolite vs Obsidian texture, color, appearance and maintenance in the next section.