Had a TSA employee in New Orleans tell me I could not fly with a crystal block. When I asked to see a supervisor, she told me the person working with her was her supervisor. I pointed out that they both only had one stripe on their shoulders, and supervisors have two or three stripes on their shoulders. She then called over a supervisor (who had three stripes) and he looked at the block and advised that I could fly with the block. As I walked away with my block, I could hear the supervisor asking the two what they were thinking.