AM_Retzian Formula: Y As Mn2 O8 H4 Name: Retzian Unit cell: 5.67 12.03 4.863 90.0 90.0 90.0 , V=331.71 Space group: PBAN (50)

Moore P B , American Mineralogist , 52 (1967) p.1603-1613, Crystal chemistry of the basic manganese arsenate minerals 1. The crystal, structures of flinkite, Mn2Mn(OH)4(AsO4) and retzian, Mn2Y(OH)4(AsO4)