Actually, these are some meteorites! In my Origins of the Universe class the other day, my teacher passed around a couple of examples of meteorites. It was amazing to hold a piece of the sky's history in my hands. Especially since these samples are around 4.65 billion years old!
This is of the same meteorites, just flipped over.
This is just a rock he passed around, so I figured I could take a picture of it too.