The optical properties of airborne mineral dust depend on its mineralogy, size distribution, shape, and might vary between different source regions. To date, large differences in refractive index values found 29 in the literature have not been fully explained. In this paper we present a new dataset of complex re-30 fractive indices (m=n-ik) and single scattering albedos (SSA) for 19 mineral dust aerosols over the 370-31 950 nm range in dry conditions. Dust aerosols were generated from natural parent soils from eight 32 source regions (Northern Africa, Sahel, Middle East, Eastern Asia, North and South America, Southern 33 Africa, and Australia). These were selected to represent the global scale variability of the dust mineral-34 ogy. Dust was re-suspended into a 4.2 m 3 smog chamber where its spectral shortwave scattering (βsca) 35 and absorption (βabs) coefficients, number size distribution, and bulk composition were measured. The 36 complex refractive index was estimated by Mie calculations combining optical and size data, while the 37 spectral SSA was directly retrieved from βsca and βabs measurements. Our results show that the imagi-38 nary part of the refractive index (k) and the SSA largely vary from sample to sample, with values for k 39 in the range 0.001 to 0.009 at 370 nm and 0.0003 to 0.002 at 950 nm, and values for SSA in the range 40 0.70 to 0.96 at 370 nm and 0.95 to 0.99 at 950 nm. In contrast, the real part of the refractive index (n) 41 is mostly source (and wavelength) independent, with an average value between 1.48 and 1.55. The 42 sample-to-sample variability in our dataset of k and SSA is mostly related to differences in the dust's 43 iron content. In particular, a wavelength-dependent linear relationship is found between the magnitude 44 of k and SSA and the mass concentrations of both iron oxide and total elemental iron. As an intrinsic 45 Atmos. Chem. Phys. Discuss., https://doi.