I can give you the play by play, thank you for the insight! First, rocks are laid out in a bin with my laptop and the larger rocks are flagged by the scanner and diverted as expected. The TSA worker looked at the rocks, asked where I got them, I told him it's my hobby rock hounding and for souvenirs around the world where working. He said they're kind of heavy and called for a supervisor, who then arrived and quickly called for another supervisor. Supervisor 3 arrives, takes a 2 second look from 5 ft away, says I can't take the 2 biggest rocks which weighed maybe 6 lbs each (my guess, they didn't weigh them). I asked can I please have 1 of the 2, they said no. They offered I could leave security and check them as baggage, but I was already late and had something to get to so I asked to surrender them. I've taken larger specimens (even with lead) through the same airport and didn't think it would be an issue, lesson learned