Buy Rocks, Fossils, Minerals, Crystals, Books, and More! While specializing in St.Clair PA fern fossil display slabs, we also sell wholesale bulk fossil slab, mineral, and crystal lots. Sometimes collectibles, and an occasional book lot. We have been selling on eBay since 2003, while still maintaining a Perfect 100% Rating(seller name "earthfragments"). We still list over there occasionally, but would like to ween ourselves off of it eventually. We feel places like this may help us accomplish that more sooner than later.