The Colorado was originally mined for Lead, Silver, and Fluorine. There I found pieces of Fluorite infused with surprisingly strong green Willemite, also phosphorescent.
Nayal Black Hawk is a group of mines that encompasses an area of several small hills. It was originally mined for Fluorine, Lead, and Silver. Fluorite is indeed plentiful here and on the hillside I found some pieces just sitting on the surface, apparently not from any mining activity. There were a wide variety of fluorescent minerals there including Hydrozincite, Calcite, Fluorite, Willemite, Hyalite, and Caliche.