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Scientists analyzing lunar soil returned by China's Chang'e-6 mission have discovered a previously unidentified magnetic mineral, a form of metallic iron called γ-Fe, embedded in tiny impact-glass particles. The nanoscale iron can retain a stable magnetic signal over time. Researchers say the mineral could act as a microscopic "fossil" record of the Moon's long-lost magnetic field, offering new clues about the Moon's ancient geologic and magnetic history.