Left: DC16-14-309-a AFMIR maps recorded at 1710 cm⁻¹ (green), 1600 cm⁻¹ (red), and 1460 cm⁻¹ (blue), composite (red, green, blue) image of the three maps, and AFM height and back-scattered electron (BSE) image of UCAMM DC16-14-309-a. Top right: far-field spectrum. Vertical lines in the inset indicate the laser settings used to map the sample. Bottom right: sulphur, silicon, iron, magnesium, and oxygen X-ray maps. The largest minerals identified are labelled (Sil: silicates; FeS: iron sulphide). We note that the very bottom-right area seen in S without counterpart in Fe probably corresponds to elemental sulphur from the sample preparation. The AFMIR 1710 cm⁻¹ map is shown at the same scale.