Kalliope sings rock and metal: https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/staf640/8115780?login=false -> Small relatives of the much-larger #Kalliope, a metallic main-belt asteroid, shed light on their mutual origin early in solar system history: https://skyandtelescope.org/astronomy-news/metal-shards-shed-light-on-the-origin-of-asteroid-kalliope/