This study presents observational constraints concerning the chemical composition of meteoric smoke particles in the mesosphere, using measurements from the Solar Occultation For Ice Experiment (SOFIE) in conjunction with meteoric smoke models. Comparing the multi-wavelength observations with models suggests compositions magnetite, magnesiowüstite, or olivine. Some smoke compositions are excluded in the SOFIE-model comparisons, however, this may because the materials are weakly absorbing at the SOFIE wavelengths. Knowledge of smoke composition allows the SOFIE extinction measurements to be converted to smoke volume density (V). Comparing observed V with model results for varying meteoric influx (MIF) provides constraints on the ablated portion of the MIF. The results indicate an ablated MIF that likely represents meteoric iron and magnesium only, when considering the identified compositions and simulations of smoke extinction at the SOFIE wavelengths.