I presume you are asking about the rocks in the front of the pics and not the ones in the background. Most look just like regular river wash gravel. Perhaps, clean up with soap and water the one from picture 3 as it is kinda interesting with all the little circles. The one from the last picture (6) might be fun to put into a rock tumbler. Same with the one in the background of picture 5 which looks like it might have some pyrite stringers.