Cool agate!!
Anyone collect flourescent minerals? I'll collect whatever I can get my hands on, but I particularly like flourescent ones. You have to use a black light to see them. I worked at the Sterling Hill Mine & Museum years ago (if you know fl minerals you know Sterling, it's like Mecca for collectors LOL) and started a small collection then.
I can post a link if anyone is unfamiliar.
When we went to TN for vacation I brought my light with me into the caves. Found quite a bits of flourescence that even the staff was unaware of. Fun stuff.