Check the listing for details. JH18165 Sphalerite or Wurtzite, Rosh Pinah Mine, Namibia. Listed at 75.00 USD. This has a mineral, or minerals, that fluoresce Orange and Red under LW UV. We think this is Sphalerite, Wurtzite or maybe a combination of both. We think this might be Barite. The Sphalerite/Wurtzite may be on a Barite matrix as well.