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a) Comparison of DRS-derived qualitative goethite content from corrected box data and ATR-FTIR-derived goethite content. b) Comparison of DRS-derived L* values from corrected box data, considered here as a proxy of calcite content (see text), and ATR-FTIR-derived calcite content. Based on 719 data points, both comparisons follow a linear trend and correlate significantly well.
