We have measured reflectance spectra (0.35–20μm) of a suite of minerals and synthetic compounds that contain low-Z (⩽Na) elements as the major cation and/or the major anion in oxides/oxyhydroxides, and are relevant to planetary geology and astrobiology. The suite comprises Na-borates, Na-, K-, Ca-hydroxides, nitrates, nitrites, and peroxides. Na-borate spectra exhibit B–O fundamental vibrations between 7 and 14μm, and overtones/combinations of these bands in the 1.55, 1.75, 2.15, and 2.25μm regions. Na-, K-, and Ca-hydroxide reflectance spectra are characterized by OH and metal–OH fundamental vibrations near 3, 8, and 18μm, and a number of overtone and combination absorption bands at shorter wavelengths, and a characteristic metal–OH band near 2.35μm. The nitrate and nitrite spectra exhibit fundamental N–O vibrations in the 7–14μm region and numerous combinations and overtones that are still detectable to as low as ∼1.8μm. Na-peroxide is largely spectrally featureless below 24μm, making its detection problematic, while H-peroxide has many OH-related absorption features below 2.5μm that differ in position from those of H2O ice and liquid. The results of this study indicate that the borates, hydroxides, nitrates, nitrite, and hydrogen peroxide can all be uniquely identified using characteristic absorption features that are present below 2.5μm. However, some of these features are weak, and their detectability will depend on the types and abundances of any accessory phases that may be present.