I took the rocks to a local college .The guy in charge takes 1 rock out of the bag & looks at it for about 3 seconds drops it back in & says serpentine ....That was about it after a drive of 45 mins. each way for me.Any how----- i wanted to know what they were,i have gotten some mixed results from others who i know have a lot of exp. in rocks.Like it has no quartz & it is massive quartz.... I know my area had a lot of visitors from the 16th/17th/18th century.. So when detecting i try and find out what it is first & then work on what part of the world it may have come from,because it could be from anywhere in the world.I don't think the rocks came from the earths crust in my area- i have a better chance of a rock falling out of the sky.They could be ship ballast rocks for sure-and that's why a good Id would really help.... Is serpentine really this pretty & magnetic?I don't know any thing about rocks & these are the 1st i brought home from a hunt..This magnet is really not that strong & is off my fridge... Thanks again for the help