A few rare meteorites come from the Moon 0. In other words, they are rocks found on Earth that were ejected from the Moon by the impact of an asteroidal meteoroid or possibly a comet. Because the Moon has no atmosphere to stop them, meteoroids strike the Moon every day. Lunar escape velocity averages 2.
Polymict breccia, lunar thin section 14305
Polymict Breccia, sample
Citation: Martel, L. Planetary Science Research Discoveries. The non mare rocks that dominate the highlands of the Moon are particularly fascinating because they tell us about the origin of the most ancient crust. Researchers Allan Treiman, Amy Maloy, Juliane Gross Lunar and Planetary Institute, Houston and Chip Shearer University of New Mexico took a look at a particular kind of fragment inside these meteorites so geochemically distinct from other highlands materials as to warrant further investigations of their mineral, bulk, and trace element compositions. The attention-grabbing fragments are magnesium-rich anorthositic granulites that tell part of the story of lunar crustal evolution, though the details of the story are still being worked out. Magnesian anorthositic granulites, found in several distinct lunar meteorites, may represent a widespread rock type in the highlands, a notion supported by remote sensing chemical data. These fragments could be metamorphosed relicts of KREEP -free plutons that intruded into the plagioclase-rich ancient crust.
The word has its origins in the Italian language, in which it means "rubble". A megabreccia is a breccia composed of very large rock fragments, sometimes kilometers across, which can be formed by landslides,  impact events,  or caldera collapse. Sedimentary breccia is a type of clastic sedimentary rock which is made of angular to subangular, randomly oriented clasts of other sedimentary rocks.
Moon rock or lunar rock refers to rock that is found on the Earth's Moon. This includes lunar material collected during the course of human exploration of the Moon , and rock that has been ejected naturally from the Moon's surface and landed on the Earth as meteorites. Moon rocks on Earth come from four sources: those collected by six United States Apollo program crewed lunar landings from to ; those collected by three Soviet uncrewed Luna probes in the s; those collected by the Chinese Lunar Exploration Program 's uncrewed probes; and rocks that were ejected naturally from the lunar surface before falling to Earth as lunar meteorites. Three Luna spacecraft returned with grams The Soviet Union abandoned its attempts at a crewed lunar program in the s, but succeeded in landing three robotic Luna spacecraft with the capability to collect and return small samples to Earth.