12 Very Cool Swirl Marbles Different Colors And Sizes

Lot of 12 very cool looking marbles. I put a quarter in the picture to help show the size. These are a bunch of different color and cool cool swirls. I am using a365 black light that I use for the mineral in rocks. It tends to show the glow more and a regular black light won't show the glow that a 365 light shows. So I don't know if that means it's still uranium in the marbles or other minerals. I know nothing about marbles and recently bought a lot at a few different estate sales. I have separated some lots into like colors. Some will be mixed but ones I got at one sale. Please feel free to ask any questions. Please see pictures, I rely on them to show condition.