Citation: Daniel M. Wells; Geng Bang Jin; S. Skanthakumar; Richard G. Haire; L. Soderholm; James A. Ibers (2009). Quaternary Neptunium Compounds: Syntheses and Characterization of KCuNpS3, RbCuNpS3, CsCuNpS3, KAgNpS3, and CsAgNpS3. Inorganic Chemistry, 48, pp. 11513-11517.
Formula: Cu Np Rb S3
Chemical name: copper neptunium rubidium trisulfide'