A phage display method employed to identify peptides that bind to and promote the direct and rapid room-temperature formation of CaO.MoO₃ (powellite) microparticles from aqueous precursor solutions was investigated. Microscale calcium molybdate-based powders are attractive as phosphor particles for advanced lighting and display applications as catalysts in petrochemical processing. The identification of peptides that locally induce the precipitation of such multicomponent oxide compounds could allow for organized functional structures at room temperature followed by peptide-induced mineralization would yield functional multicomponent oxides with tailored morphologies. Precipitation assays were conducted to assess whether these peptides would promote the formation of CaMoO₄ from aqueous precursor solutions.