Overview
- Researchers re-examined a microscopic slice of the Martian basaltic breccia NWA 8171 and corrected an initial pyroxene ID to show the presence of andradite, an iron-rich garnet.
- The garnet appears as microscopic crystals smaller than a poppy seed in a sample held at the Royal Ontario Museum and was identified by a team led by Tanya Kizovski of Brock University.
- Andradite is valuable because its chemistry can record the temperature, pressure and fluids present when it formed, so even tiny grains can preserve detailed geologic signals.
- Scientists do not yet know if the garnet grew on Mars or was incorporated from another body and will use targeted isotopic measurements to test the mineral’s provenance.
- If the grains prove Martian, the finding could change how researchers read early Martian magmatic, metamorphic or impact events and will prompt follow‑up studies to map where and how such conditions occurred.