The Oberursel Mineral and Fossil Exchange is an annual event traditionally held on the second weekend of January, opening a fascinating world for collectors and enthusiasts of natural wonders. Since its inception in 1979, this exchange, organized by the Oberursel/Ts Association for History and Local Studies, has established itself as a central meeting point for enthusiasts. The fair's core offering includes an impressive selection of minerals and fossils from around the world. Visitors can admire rare and exquisite pieces ranging from agate from Idar-Oberstein and Brazil to sphalerite from Germany or China. The fossils are equally diverse, originating from countries like Madagascar, England, France, or Germany. A special feature of the exchange is its motto, "By collectors, for collectors." This is reflected in the atmosphere and the nature of the exhibits presented. Here, the focus is not on commercial sales, but on sharing knowledge and experiences among like-minded individuals. Visitors have the opportunity to learn, ask questions, and, of course, acquire pieces for their collection. The exchange consciously avoids stone art and jewelry to focus on the natural beauty of the minerals and fossils. This approach sets it apart from other fairs and makes it a unique event for true collectors. The event takes place in the Oberursel City Hall, which is easily accessible and offers visitors a parking garage. The city hall provides a suitable and appealing environment to present these natural treasures appropriately and to encourage exchange among visitors. Overall, the Oberursel Mineral and Fossil Exchange offers a unique opportunity to experience the beauty and diversity of nature, interact with other collectors, and discover and acquire rare pieces. It is a must-visit for anyone interested in the world of minerals and fossils. The Mineral and Fossil Exchange takes place annually, and therefore for the Forty-Sixth time previsibly in January 2026 in Oberursel.