"It’s just a little rock."

No it isn't. It is a piece of granite, which I can tell by the coarse grain. It is an intrusive igneous rock formed from volcanic magma with a high alkalai, silica, and metal oxide content. It cooled deep in the earth, and then ascended over millions and millions of years due to the processes of plate tectonics. A little piece broke off the mass, was subjected to weathering, and then sat with a bunch of other small pieces of rock in flowing water for millions and millions of years until it wore down to its present smooth shape. Of course it could be a piece of basalt, gabbro, or a metamorphic or sedimentary rock as well, but this particulay pebble is granite..

That little rock has a story to tell, and anyone with the proper education in geology can understand it. It's like that with everything, but the problem is that no one can know everything.