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The cross-section of Sayh al Uhaymir (SaU) 290, a CH3 chondrite, observed by the NanoSIMS in a) secondary electrons, b) ¹⁶O⁻, c) ¹²C₂⁻ and d) ¹²C¹⁴N⁻. Each square grid represents a single NanoSIMS image, capturing a surface area of 20 × 20 μm². By recording and stitching a large number of these single images, the maps (a) - (d) were created to analyse the microscale surface morphology and chemical distribution of SaU 290.