Quote

A lot of the rocks we have on Earth aare pretty old, but none of them were around when our planet was first formed. The Earth itself is around 4.5 billion years old, and the oldest rocks we’ve ever found are a little over half that age. That seems to have changed, however, because a group of scientists recently announced they’ve found a rock that formed only half a billion years after the Earth itself. The twist is that this particular rock wasn’t discovered on Earth at all. It was found on the moon.

https://www.yahoo.com/news/earths-oldest-known-rock-found-211500968.html

Thanks, just read that article at https://phys.org/news/2019-01-moon-recovered-astronauts-earth.html

 

And the associated paper.....

https://www.sciencedirect.com/science/article/pii/S0012821X19300202?via%3Dihub