My 9-year-old bought me the willemite chunk as a birthday present and I love it. I keep it with my yooperlites. I’d love to be able to get other UV-reactive specimens as well. The only trouble was the rock scuffed the barcode from inside and it caused USPS to keep looping it through various postal facilities and I finally was able to get them to deliver it after a month when I called and asked them to physically track it down. Some extra padding around the rocks in the envelope might be helpful for future shipments, but I understand the need for small businesses to keep costs in check.