Bluebonnet Swamp Nature Center hosted its seventh annual Rockin' at the Swamp event Saturday.

Visitors explored the vast world of geology with activities and displays about rocks, gemstones, minerals and fossils.

Hobbyists featured hands-on exhibits, and vendors sold gemstone jewelry, rough and polished mineral specimens, fossils and more.

At the "Gold" Mine, people hunt for the perfect pyrite specimens for their collections.