About its source: first, it can be transported from far upstream (more than tens of kilometers); Second, it is possible to develop this kind of rock in a small area near the top of the mountain, but it is impossible in a large area. It is normal that only one or two pieces roll down occasionally.

Judging from its color and structure, combined with its heavy characteristics, it is inferred that it is an iron-containing or molybdenum-containing ore.

You can consider sending samples for analysis.