AM_Alunite_4 Formula: K.875 Al3 S2 O14.125 D12 Name: Alunite Unit cell: 6.943 6.943 17.227 90.0 90.0 120.0 , V=719.17 Space group: R-3M (166)

Schukow H , Breitinger D K , Zeiske T , Kubanek F , Mohr J , Schwab R G , Zeitschrift fur Anorganische und Allgemeine Chemie , 625 (1999) p.1047-1050, Localization of hydrogen and content of oxonium cations in alunite via neutron, diffraction, Locality: synthetic, Sample: T = 2 K