Standing alone against the fragmented plains of Jezero Crater’s Vernudden region is a sharply sculpted rock that has commanded the full attention of NASA’s Perseverance rover team. About 80 centimeters across, “Phippsaksla” rises prominently above its surroundings, its peculiar shape suggesting its history is unlike that of the bedrock beneath it. But what really makes this rock so extraordinary is not its appearance; rather, it is its composition-the elemental fingerprint that says it came from somewhere other than Mars.
The SuperCam instrument on Perseverance a combination camera, laser, and spectrometers designed to interrogate the chemistry of Martian materials revealed that Phippsaksla contains extraordinarily high levels of iron and nickel. This pairing is the hallmark of iron-nickel meteorites, a rare class of space rocks that originated from the cores of large asteroids. In the early Solar System, molten asteroids underwent differentiation, where dense metals sank inward to form metallic cores. Catastrophic collisions shattered many such bodies, sending fragments out into interplanetary space. Such debris, when intercepted by planetary atmospheres, becomes meteorites-preserved records of primordial planetary building blocks.
Iron-nickel meteorites are much rarer than stony meteorites, including only about 6% of witnessed falls to Earth. Still, they are overrepresented in collections due to their resilience during atmospheric entry and resistance to weathering. On Mars, with its thin atmosphere and much-reduced erosion rate, such metallic visitors could remain intact for millions of years. Past rovers have documented such finds: Curiosity spotted the “Cacao” meteorite in 2023 and the much larger “Lebanon” meteorite in 2014, while Spirit and Opportunity also came across similar finds. Yet Phippsaksla represents the first iron-nickel meteorite that Perseverance has found so far in Jezero Crater a surprising fact given the crater’s age and the prevalence of impact features in this area.
Preservation of the rock is likely helped along by the low humidity, minimal oxidation, and reduced mechanical weathering on Mars compared to Earth. The cavernous surface texture captured here by the Mastcam-Z camera on Perseverance may be due to regmaglypts: shallow pits that form when vortices of superheated gas scour the rock during atmospheric entry. These are common in other Martian meteorites and are a key diagnostic of the conditions of entry.
Confirmation of Phippsaksla as a meteorite will require further in situ investigation. Perseverance is equipped with PIXL, the Planetary Instrument for X-ray Lithochemistry, capable of very fine-scale mapping of elemental distributions that would help better constrain the mineral phases in the rock. If confirmed as a meteorite, the sample would become a candidate for inclusion in the rover’s cache of samples that could be returned to Earth. The Mars Sample Return program faces significant logistical hurdles but would enable investigators to study Phippsaksla using laboratory methods well beyond the rover’s capabilities, including the potential detection of isotopic signatures related to the formation history of its parent body.
Beyond its novelty as a geological find, Phippsaksla represents a tangible link with the violent processes that took place during the early Solar System. Every iron-nickel meteorite is a fragment of a planetary embryo’s heart, forged within a molten interior and freed by high-energy impacts. Such materials, when studied on Mars, present a unique comparative dataset: the Martian meteorite population may differ from that on Earth due to differences in orbital dynamics and atmospheric filtering, offering insights into the evolution of the asteroid belt and impact flux over billions of years.
To the planetary geologists and the astrobiologists, Phippsaksla is more than an isolated curiosity-it’s a messenger from deep time, carrying in its alloyed lattice the record of cosmic events which preceded Mars itself. Every laser pulse and every scan of the spectrometer continue the traverse of Perseverance, bringing the team one step closer to decoding not just the journey of that rock but the greater narrative of planetary formation and interplanetary exchange it represents.
