Mars Meteorite From Sahara Is 4.1 Billion Years Old

A rose-colored Mars meteorite pulled from the Sahara Desert just became one of the most important space rocks ever studied. According to NASA, the nearly two-pound stone, named Teghaza 001, formed more than four point one billion years ago, and scientists are already calling it a Rosetta Stone for the Red Planet.

The research landed in the journal Science on Thursday, and it is the kind of story that makes the whole internet go quiet for a second. A chunk of another world, found by a collector in West Africa, is now rewriting what researchers think early Mars looked like.

A Pink Rock From Mali

The meteorite was found in 2022 on a salt plain called Teghaza in Mali, which is where it got its name. It weighs about eight hundred grams, roughly two pounds, and it has an unusual rosy color that makes it stand out from typical dark space rocks.

Out of roughly four hundred thirty-five known meteorites from Mars, this one now ranks among the three oldest. Researchers at the University of New Mexico had already matched its oxygen isotopes to other Martian samples, which act like a geochemical fingerprint for a planet.

Lead author Yang Liu of NASA's Jet Propulsion Laboratory almost skipped it at first, because it looked like a common type of Martian rock. Then she saw the odd textures and strange minerals. In her words, quoted by NASA, "It was only after we started looking closely that we realized this meteorite is really unique."

Why Scientists Are Hyped

Two other ancient Martian rocks already exist on Earth. One is ALH84001, made almost entirely of a single mineral. The other is the nickname-famous Black Beauty, which formed about two point one billion years ago and is built from small volcanic fragments. Both give only narrow peeks into Mars history.

Teghaza 001 is different because it holds a mix of volcanic minerals that tells a bigger story. It shows how the planet's crust formed from cooling magma and was later altered by water underground. Its chemistry also matches what NASA's Mars Reconnaissance Orbiter has seen in the cratered southern highlands, and the paper lists thirteen possible origin spots on the planet.

Second author Lee Saper, now at NASA's Ames Research Center, put it plainly, as reported by CBS News: "This is really our first piece of Martian crust from a part of Mars we've never had a sample of before."

The Tiny Sample Trick

The age came from zircon crystals, tiny minerals that lock in a timestamp when a rock forms. Caltech geochemist Francois Tissot helped the team use a newer method called in-situ rubidium-strontium dating, which looks at single mineral grains on the surface instead of dissolving the whole rock.

That matters because Martian meteorites are rare and precious. The technique used a piece smaller than a fingernail and still delivered a precise result, leaving the rest of the meteorite intact for future studies. Tissot said his lab is one of very few in the world able to do this kind of dating, and the first to date such an ancient Martian meteorite.

The results showed that water altered the rock around four point one billion years ago, which means the stone itself may be even older. Clues in the isotopes, texture and chemistry point to a more dynamic water cycle on early Mars than many scientists assumed.

What Comes Next

This Mars meteorite already has a second paper behind it. A separate study in Science Advances, published in June, looked at the water content in the rock and how water may have shaped the early surface of the planet.

Liu and her co-authors say they are just getting started, and they want the wider science community to dig in. As Liu told NASA, "We've only scratched the surface." For anyone following the hunt for ancient water and habitable conditions beyond Earth, a free sample from Mars that fell into a desert is a pretty big deal.

It also lands in a busy month for the Red Planet, with Japan's Phobos sample mission launching and rovers still rolling. For more stories like this, check out the science section and the world desk on GenZ NewZ.