Although geodes have been found on every continent except Antartica, most which show up in the US that look like yours (professionally-cut-&-polished) are imports from Brazil, although some other South American countries and Mexico are possibilities.
Nokta FoRs Gold, a Gold Cube, 2 Keene Sluices and Lord only knows how many pans....not to mention a load of other gear my wife still doesn't know about!