Yang Liu nearly passed on Teghaza 001 before the Martian meteorite became the focus of a Science paper. The rose-colored rock, found in the Sahara Desert in 2022, turned out to be a piece of Mars that formed more than 4.1 billion years ago.
It weighs nearly 2 pounds, or 800 grams, and sits among roughly 435 meteorites from Mars found on Earth. Its age puts it among the three most ancient Martian meteorites known, a group that gives researchers a rare look at Mars before later alteration by subsurface water.
Yang Liu and Lee Saper
Liu said, “It was only after we started looking closely that we realized this meteorite is really unique.” She also said, “One of the paper’s reviewers called it a Rosetta Stone for Mars.” The meteorite was named Teghaza 001 after the salt plain in Mali where it was discovered.
Lee Saper said, “This is really our first piece of Martian crust from a part of Mars we’ve never had a sample of before.” Saper added, “It records interactions of water and rock and maybe even an imprint of the Martian atmosphere as it was losing water.”
Science paper on Teghaza 001
Scientists identified the rock as Martian by matching its mineral and chemical components to data collected by NASA missions including Viking, Curiosity, and Perseverance. The meteorite has a mix of igneous minerals, and its distinctive mineralogy matches what NASA’s Mars Reconnaissance Orbiter has observed in Mars’s cratered southern highlands.
A separate paper in Science Advances in June detailed the meteorite’s water content. Together, the two papers place Teghaza 001 as an unusually complete sample: old crust, later water interaction, and a chemistry that can still be matched against data from Mars.
Mars source region
Researchers identify several potential locations on Mars that match Teghaza 001’s mineralogy and chemistry. No one will ever know exactly where the meteorite originated on Mars, even though the paper points to more than one likely source region.
That leaves the rock valuable in a practical way for future studies: each new analysis can sharpen the picture of how water and rock interacted on ancient Mars, while the exact launch point on the Red Planet remains unresolved. The sample already carries the weight of a first look at crust from a part of Mars scientists had not sampled before.
