Thank your ideas. Yes I have many minerals that glow under UV light but I also have a UV lamp but its capacity is quite weak, I will buy a new one and take pictures. I wanted to do that for a long time, but I was also quite busy with research projects so I forgotTuyen Nguyen That's a beautiful crystal. Very nice photo. I have seen your other crystals and have wanted to suggest to you something that you may be interested in but will be very different - UV light, some of these minerals you have may be fluorescent under UV light. Just something to consider.