Scientists Discover First Garnet Mineral in Martian Meteorite
Martian Meteorite Analysis Reveals First-Ever Garnet and New Rock Type
Scientists have identified a completely new type of rock on Mars and detected the mineral garnet in a Martian sample for the first time. The discovery stems from analysis of a fragment of the Martian meteorite NWA 8171, currently housed in the collections of the Royal Ontario Museum. Led by Tanya Kizovski of Brock University, the international team offers a rare glimpse into the planet’s ancient past and could help piece together its 4.5-billion-year geological history.
The Tech TL;DR:
- Researchers found a novel rock type and the first identified Martian garnet inside meteorite fragment NWA 8171.
- Electron microscopy and specialized laser equipment at the University of Portsmouth and the Royal Ontario Museum drove the mineral analysis.
- Scientists caution that isotopic testing is still required to confirm whether the garnet-bearing sample formed natively on Mars or arrived via an extra-Martian impactor.
Microscopy Analysis of Meteorite NWA 8171
The research began when Kizovski examined the meteorite section and noted unusual chemical properties. The analytical team initially suspected the mineral was pyroxene, which is very common. Subsequent testing using the University of Portsmouth Electron Microscopy and Microanalysis Unit alongside the museum’s specialized laser equipment revealed the presence of garnet. Professor James Darling of Portsmouth’s School of the Environment and Life Sciences joined Kizovski on the research team.
On Earth, garnet provides a record of the tectonic forces, ore-forming processes and fluid-rock interactions that shape the crust and mantle. The discovery on the Martian sample provides clues about the temperatures, pressures and processes that shaped the planet billions of years ago. On Mars, the extreme heat and pressure necessary to drive such metamorphism could originate from magma rising into the crust, a surface meteorite impact, or a combination of both events.
Oxygen Isotope Testing Could Reveal the Rock Origins
Despite the mineral identification, the research team emphasizes that the rock’s native origin remains unconfirmed. The sample may have formed on another planetary body before being launched into space and landing on the Martian surface. To resolve this ambiguity, researchers must measure oxygen isotopes directly from the rock to verify whether the material developed locally.
Measuring these isotopes requires destroying a portion of the sample. Because NWA 8171 represents an extremely rare specimen—potentially the only garnet-bearing Martian rock currently available for laboratory study—investigators have deferred destructive testing. Museum curator Kim Tait and Research Assistant Jessica Tomacic are continuing non-destructive analysis alongside Darling, with plans to compare the sample against rover and orbital data.
The research project receives financial backing from the Government of Canada’s Natural Sciences and Engineering Research Council, the Killam Trusts Dorothy Killam fellowship, and Science and Technology Facilities Council funding at the University of Portsmouth.