Neutron stars would presumably consist in large part of QM, if it exists. Colliding neutron stars spray large chunks of material therefrom, into interstellar s

Neutron stars would presumably consist in large part of QM, if it exists. Colliding neutron stars spray large chunks of material therefrom, into interstellar space. It is said that this contributes a significant percentage of the gold and uranium on Earth. If QM were stable, would we not therefore expect to observe it in nature, with abundance at least on the order of gold and uranium? Perhaps there is some factor that depresses its abundance somewhat, but to have gone entirely unobserved, it would have to be many orders of magnitude less abundant than gold. Is there any theory that reconciles stable QM with the observed upper bound on abundance?