State Rock: Prairie Agate (1967)
State Gemstone: Blue Chalcedony (Agate) (1967)
State Fossil: Mammoth (1967)
Nebraska is almost completely devoid of precious gemstones but it is home to some of the best Agate in the US. You can also find Petrified Wood, Chalcedony, and even Geodes.
Please note that rock collecting locations are always changing so be sure to check with the site owner for the most current information before going.
Dig safe, never go underground, and make sure to get permission from the landowner to search for and collect rocks.