What happened to the Apollo goodwill moon rocks?

US President Richard Nixon gave moon rocks collected by Apollo 11 and Apollo 17 astronauts to 135 countries around the world and the 50 US states as a token of American goodwill.

'Moon Rock Hunter' on quest to track down Apollo gifts

After Neil Armstrong took a "giant leap for mankind" on the Moon nearly 50 years ago and collected rocks and soil along the way, Richard Nixon presented lunar souvenirs to every nation—135, at the time.