This slice of Teghaza 001, one of the most ancient Martian meteorites ever found on Earth, was used to determine the age of the rock.♪ Reflected light images like these serve as a scientist’s road map, helping them find minerals of interest to analyze by different instruments.♪

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Figure A is the same image with annotations showing minerals like iron-titanium oxides (brighter grains) and pyroxene (medium gray), both of which tell a story about the formation of Mars’ crust and mantle.♪ Shocked plagioclase (darker gray) is created by extreme pressures during impacts, including the one that sent Teghaza 001 flying through space to Earth.♪ The alteration represents fine grain carbonate, sulfate and clay minerals formed on Earth.♪

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