If you've learned to tell igneous rocks from sedimentary and metamorphic rocks, you're ready for the next step, which is to learn the basic textural terms that geologists use when describing igneous rocks. Texture is the close-up character of the rock—the size and relationships of the grains that make it up, plus a few other important characteristics like the presence of holes and so on. See them in this new gallery. You might call these the seven textures of highly successful igneous petrologists.
_{Vesicular texture — Geology Guide photo}