rock is the collective name. you get all kinds of rock. Sedimentary, Igneous and Blackpool. metamorphic rock as boots was referring to is a combination of those that formed in different temperature and pressure zones within the planet. i like rocks, rocks are my friends. they rock.
You can become a rock yourself - or rather, rock. There is an article in National Geographic about how to plan your own burial so that you will become a fossil that can be found by future paleontologists.
It's not a geological at all.... It's a giant freekin lizards head complete with the remains a a human leg sticking out of its mouth!