4.1-Billion-Year-Old Martian Meteorite Found in Sahara Desert Offers Clues to Ancient Water

A pink rock discovered in the Sahara Desert in 2022 has been confirmed by NASA-funded researchers to be a Martian meteorite that formed more than 4.1 billion years ago. Named Teghaza 001 after the salt plain in Mali where it was found, the 800-gram specimen preserves signs of ancient volcanic activity and early water-rock interactions on Mars.

According to findings published in the journal Science and detailed in an October 2026 NASA report, the meteorite is among the three oldest Martian meteorites ever identified on Earth. Researchers from institutions including NASA's Jet Propulsion Laboratory and the University of New Mexico utilized oxygen isotopes and in-situ rubidium-strontium dating to analyze tiny mineral grains while keeping the rare rock largely intact.

Mineral Insights and Ancient Water

• Zircon Crystals: Geologists studied these crystals to determine the rock's age and formation conditions.
• Igneous Minerals: Formed from cooling molten rock, providing data on early Martian crust development.
• Water Interaction: Mineral chemistry suggests water interacted with the planet's crust approximately 4.1 billion years ago.

Practical Implications and Verification

While researchers have matched the meteorite's chemical profile to 13 possible locations on Mars using data from the Mars Reconnaissance Orbiter—particularly resembling the southern highlands—its exact birthplace remains unknown. Further studies are planned to investigate how Mars evolved into a cold, dry planet and whether early conditions supported life.

Readers can review the original published studies in the journal Science and the official NASA reports to verify the methodologies and findings.