zincite - photos with big yellow flouresence

[beaujolais]

Zincite is really interesting. I'm cleaning out some items, though, and before I sell, I look at things with the UV light. The zincite is the orange crystal pendant on the right. (On the left is a 4-peaks amethyst/quartz pendant, just fyi.) So, wow, does my zincite pendant fluoresce (even more than in the photo).

Anyone know anything about zincite and what makes it fluoresce?

Oh, the colors on these two items are much nicer than in the photo. The 4-peaks does have the reddish purple and the zincite is a bright orange.