Figure 5. Reflectance as a function of dark mineral matter (left). Figure 6. Reflectance as a function of organic carbon (middle). Figure 7. Visible reflectance and iron oxide content (right).

Figure 5. Reflectance as a function of dark mineral matter. Total reflectance values of the CODOS WY13 ALM and the SASP ALM samples (excluding the SASP WY11 outlier) are sensitive to dark mineral matter content (IRM). IRM-0.3T is a measure of magnetite content and is used as a proxy for total amounts of dark minerals (left).

Figure 6. Reflectance as a function of organic carbon. There is a general association between organic carbon content, especially in SASP samples, and reflectance whereby total reflectance decreases as organic carbon content increases. The SASP WY11 reflectance value may be related to certain forms of carbonaceous matter, as suggested by the high abundance of organic carbon (~5.5 %) (middle).

Figure 7. Visible reflectance and iron oxide content (HIRM) of the ALM dust lack a strong correlation due to the small range of values, influence from other dust components, and sensitivity of HIRM measurements to sizes and occurances of iron oxide minerals.