185 1 year, a businessman from Illinois brought back a palm-sized gold-plated crystal stone from California. When he showed it to his friends, the stone accidentally slipped from his hand and fell to the ground and broke into pieces. In the middle of the rubble, they found an iron square nail, slightly corroded, but straight and with a complete nail head. According to the investigation, the history of this crystal stone is over 6.5438+0 million years.

1865, an iron screw with a length of 0.0508m was found in a feldspar in Nevada. This screw has been oxidized, but the shape of the screw can still be seen from the traces in the feldspar. After testing, this stone has a history of 2 1 ten thousand years.

iron nail