Chang'e-4 intentionally landed inside the moon's von Karmm crater, one of the biggest known structures in the solar system. As National Geographic points out, if scientists are going to find lunar mantle material anywhere, that's a good place to look. In exploring the carter's basin, Yutu-2 reported two minerals: low-calcium (ortho) pyroxene and olivine.
Scientists suspect that the moon's crust and mantle layers are distinct from each other, thanks to the ancient magma ocean.
To date, no one has collected mantle samples. But some scientists warn that this study is inconclusive. Yutu-2's Spectrometer could be seeing this volcanic glass or solidified melt from the impact that first created the Von Karnman crater. Yutu-2 will continue to study these materials. Scientists agree that these minerals are a pioneering feat.