Check the listing for details. sandstone - a unique silver ore - Springdale sandstone - hand/display specimen. Listed at 10.45 USD. The Springdale Sandstone is a geological oddity. In the Silver Reef Mining District in Washington County, Utah, this sandstone contained silver chloride. Silver Reef was the only major productive district of sandstone silver ores in the US and is one of the few places worldwide where sandstone contains silver.