I recommend buying some books about where you can go rockhounding for free. James Mitchell wrote many great books, I use them for California collecting. They were published before widespread go’s technology so there aren’t gps coordinates for the sites but it’s really not a huge deal, the directions and maps are enough to find the sites. If you put an area and rockhounding into Amazon a good amount of books come back. This one looks interesting to me: https://www.amazon.com/Mineral-Treasures-Ozarks-Bruce-Stinchcomb/dp/0764347152/ref=mp_s_a_1_5?dchild=1&keywords=missouri+rockhound&qid=1620320333&sr=8-5