Opal
As I stated in another post this state has a lot of minerals, and also gemstones. One of them is black opal. Unfortunately most of it is not gemstone quality. The specimen shown is a fire opal, but not from this state. We posted it as a an example.
We do all we possibly can to help local artists. We donate this fairly expensive space for example. The current artist is an author with several books on the market. They are; Nevada a Strange State, Silveropolis, The Great Lake Mead Water Caper. They are available on Amazon. Every purchase will help the author. He wants to thank you for your help.