looking for some info on rocks that i have found usimg a metal detector

Tucson AZ

Description

Hello. Not all the rocks that are in the pics where found with a metal detector, but they were all found in AZ. Now I know alot of them are probably slag or iron ore. I'm not very good at the identification but I have about 50-60 pieces and I am wondering how you tell the difference between slag and meteorite? I have magnets and have studied myself but I wanted to make sure sure before i through them in the yard or if I kept them. Let me know if you can help me. Thanks.