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