Optical Spectra of Phosphosiderite

• Kleber w, Weiner KL (1958) Comparative crystallographic studies of the orthorhombic phosphates and arsenates of the type Y(ZO₄)​·2H₂O.  Neues Jahrbuch fuer Mineralogie, Abhandlungen, 90, 253-284.  
• Rossman GR (1975) Spectroscopic and magnetic studies of ferric iron hydroxy sulfates: Intensification of color in ferric iron clusters bridged by a single hydroxide ion. American Mineralogist 60, 698-704.     .