A linked article states > The examination found that it is an “olivine-microgabbroic shergottite,” a type of Martian rock formed from the slow cooling of Marti

A linked article states > The examination found that it is an “olivine-microgabbroic shergottite,” a type of Martian rock formed from the slow cooling of Martian magma. It has a course-grained texture and contains the minerals pyroxene and olivine, Sotheby’s says. And that magma is probably identified by isotopic composition. Similar to how we know that the Moon used to be part of Earth.