When all the grains in a rock are large and easy to see, it's described as coarse-grained.

Here are some other terms related to grain size in rocks:

* Fine-grained: Grains are so small that they can't be seen with the naked eye.

* Medium-grained: Grains are visible but relatively small.

* Pegmatitic: Refers to very large, often intergrown crystals, typically found in igneous rocks.

The size of the grains in a rock can provide valuable information about its formation and history.