What is a Martian Meteorite?
Planetary Meteorites
A Martian meteorite is a rock that was blasted off the surface of Mars by a powerful asteroid impact, traveled through space for millions of years, and eventually landed on Earth. These are genuine pieces of another planet, physically accessible without a spacecraft mission.
Written by Brian McDonald, IMCA #3323, Treasure Coast Meteorite Co.
The Journey from Mars to Earth
How Scientists Prove Martian Origin
Confirming that a meteorite came from Mars requires a converging set of evidence. The most definitive comes from a discovery that could not have been anticipated before the Space Age.
Tiny pockets of gas trapped inside certain Martian meteorites match the composition of the Martian atmosphere as measured by NASA's Viking landers in 1976. The match is exact and unique. No other source produces that combination of gas ratios.
This atmospheric fingerprint, particularly the isotopic ratios of noble gases and nitrogen, provides a direct link between the meteorite and Mars that cannot be explained by any other origin. It is the equivalent of a planetary barcode, and it was recognized as Martian in 1983 when researchers compared the gases trapped in the shergottite EETA 79001 against Viking's data.
Types of Martian Meteorites
Martian meteorites are grouped as the SNC group, named for their three founding members. Each type reflects different geological environments on Mars.
How Rare Martian Meteorites Are
Every confirmed Martian meteorite specimen on Earth represents ejected material from a single impact event that generated enough velocity to escape Martian gravity, survived millions of years in space, survived atmospheric entry, was recovered, and underwent laboratory confirmation. Each step eliminates most candidates. The result is a global supply measured in hundreds of specimens and a few hundred kilograms of material, distributed across research institutions and private collections worldwide.
What Martian Meteorites Tell Scientists
No robotic mission has yet returned samples from Mars. Martian meteorites are the only physical samples of the planet available for laboratory study anywhere on Earth. They have been used to establish the age of Martian volcanism, identify minerals formed by liquid water, measure the composition of the Martian atmosphere at the moment of ejection, and probe the deep interior chemistry of a planet we have not yet visited with a sample return mission.
Because each meteorite was ejected from a different, unknown location on Mars, the global collection samples a broader range of Martian geology than any single landing site. Together they have shaped the scientific understanding of Mars as a geologically complex, formerly water-rich world.
Every legitimate Martian meteorite has a published Meteoritical Bulletin entry with its SNC classification confirmed by laboratory analysis. Verify the name at lpi.usra.edu before purchasing. The listing should include the exact classification (e.g. shergottite, basaltic), total known weight, and a direct Bulletin link. No verified classification means no confirmed Martian origin.
Related Guides
Browse Martian Meteorites
Frequently Asked Questions
How do scientists know a meteorite came from Mars?
The most definitive evidence is trapped atmospheric gas. Shock-melted glass in Martian meteorites seals in Martian atmosphere at the moment of ejection. The isotopic composition of these gases matches Viking lander measurements exactly and is unique to Mars. Oxygen isotopes, mineral chemistry, and young crystallization ages all provide supporting evidence.
How rare are Martian meteorites?
Fewer than 400 confirmed specimens exist worldwide, representing roughly 270 kilograms of material. They make up less than 0.1% of all recovered meteorites. Individual specimens from small-find or scientifically significant types can be exceptionally scarce on the collector market.
Can collectors legally own Martian meteorites?
Yes. Martian meteorites can be legally bought and sold when they were lawfully recovered. Ownership is legal in most jurisdictions. Every legitimate specimen has a published Meteoritical Bulletin entry that can be independently verified.
What is the difference between a shergottite and a nakhlite?
Both are Martian meteorites but from different geological environments. Shergottites are younger basaltic volcanic rocks that crystallized between 150 million and 600 million years ago. Nakhlites are coarser-grained clinopyroxenites that crystallized around 1.3 billion years ago, likely from a single ancient lava flow. Nakhlites also tend to contain more evidence of water alteration.
Are Martian meteorites more valuable than lunar meteorites?
Generally yes, per gram. Martian meteorites are rarer than lunar meteorites overall, and the identification story involving the Viking atmospheric match gives them an additional layer of scientific narrative. Prices vary significantly by type, total known weight, and specimen quality. Both categories are substantially more expensive than common chondrites.
What is Black Beauty?
NWA 7034 and its paired specimens are nicknamed Black Beauty because of their dark color and high water content. They are polymict breccias representing Martian surface regolith rather than a coherent igneous rock. NWA 7034 contains the highest water content of any Martian meteorite analyzed and records the ancient Martian crust in a way no other known specimen does.
