While computational findings debate the nature of transition (direct or indirect) for Ag 3 AuSe 2 and Ag 3 AuTe 2 , the steep transition of Ag 3 AuSe 2 and steady rise in absorption for Ag 3 AuTe 2 suggest a direct and indirect gap, respectively. The broad transition observed in the Ag 3 AuTe 2 spectrum is likely partially defectdriven. For example, a moderate absorption signal below 0.5 eV suggests defect states below the bulk conduction bands. These in-gap states could contribute to the broadening of the bulk transition and result in a less defined feature near the estimated band gap of 0.6 eV. For Ag 3 Au(Se,Te) 2 , absorption develops more gradually as the Te composition approaches 1. The transition remains sharp for x = 0.1-0.75, but it becomes significantly gentler for x = 0.9, which suggests a potential mixture of direct and indirect transitions within the alloys. On that note, these materials are not likely to be suitable for direct dark matter detection applications, where a small direct band gap on the meV scale is desired.