leverite
n.— «“What you’ve got there,” he said with a grin, pointing to a cup-sized stone picked up by one of the searchers, “is probably leverite, as in ’leave her right there, it ain’t no good.'”» —“Dinosaurs are gone, but their bones are all about” by Don Hopey in Rock River, Wyoming Pittsburgh Post-Gazette (Pennsylvania) June 24, 2007. (source: Double-Tongued Dictionary)