Rough rocks from my collection! The first one (above) is from my trip to Chaco Canyon. I don’t remember where I found it but it reminded me of a chunk of broken concrete. It might be.
This one is from the campus of BYU. More specifically the Museum of Art courtyard. Even more specifically from the cobble-y stone walls surrounding the courtyard. I might have found a loose one between mortar and more rocks and took it. Oops?