This slice of a Martian meteorite, seen floating inside the International Space Station, is now part of a calibration target for SuperCam, one of the instruments aboard NASA's Perseverance Mars rover. A piece of a different Martian meteorite is part of the calibration target for the instrument known as SHERLOC (Scanning Habitable Environments with Raman & Luminescence for Organics & Chemicals). Scientists use calibration targets as a kind of default they can use to check and fine-tune the settings of their instruments. A small number of meteorites on Earth have been determined to have originated on Mars based on mineral and chemical analyses by past NASA spacecraft. https://photojournal.jpl.nasa.gov/catalog/PIA24179