Do you have to let them in the sunlight for them to glow, or do they do it on their own. By the way is it a bright glow like irridescent green? The reason is if you have to wear them in the light the phosphor in the mineral will give off light, I used to make three different colors of light with different chemicals. if they glow on their own I would have someone with a scintilaion meter/ Gieger counter check it, the only other element that glows a green is radium, once used to paint the numbers on clocks and watches. I recalled some idiot on the submarine decided that his clock was too bright so he started toremove the radium paint every radiation alarm went off, he was stripped down. decontaminated, all his personal belongings that were in the vicinity were bagged and destroyed. Just a little experience to share.