The Mineralogical Museum in Penny Hall, University of Delaware features permanent exhibition of the nationally renowned mineralogical collection. The museum supports the various programs of the university and at the same time provides educational resources for regional schools and attracts mineral enthusiasts. The Mineralogical Museum was shut down in 2007 for renovation and installation, and later reopened in 2009 with its mineral collection displayed in the newly improved gallery. The various mineral collections are as tagged as natural works of art and as illustrations of mineralogical concepts

The museum’s collection originated with the gift of the Irenee du Pont, Sr. collection in 1964 which is comprised of early 20th century minerals. It has since grown to include pieces given by other generous donors. The museum showcases each collection according to a particular mineralogical concept or theme. Newly installed display cabinets with fiber optic lighting provide accurate color balance for specimens from the wire silvers to the vivid orange wulfenites.

The Mineralogical Museum's exhibit currently includes the Crystal System Exhibit which showcases crystalline minerals with enormous variations in crystal shapes and can be grouped into six crystal systems based on the geometry of the internal structure; the United States – Canada Exhibit is comprised of minerals which are by-product of mining operations for copper, lead, zinc and other metals; and the Minerals From Caves Exhibit which features limestone from caves as well as other cave deposits including vivid pink rhodochrosite stalactities in Argentina, deep green banded malachite formations in Republic of Congo and exotic specimens from Spain.