I love all aspects of the natural world, including rocks.
I have a whole collection of them. I got them as part of a magazine I collected about rocks, gems, and minerals. I can't read the magazine, since it's in print, but I collected it anyway just so I could have the samples of each type of rock they included with each magazine.
I love to examine them, even though some of the process of doing so is difficult - or impossible - for me, due to my lack of sight.
If you're interested in this type of thing too, you might want to take a look at this list of sites for identifying rocks.
Also, here's an interesting post that details the modern and traditional uses of crystals and stones, if you're interested in them for healing and spirituality purposes too.