AM_Alunogen_1 Formula: Al2 S3 O28.4 H34 Name: Alunogen Unit cell: 7.425 26.975 6.0608 90.03 97.66 91.94 , V=1202.38 Space group: P-1 (2)

Menchetti S , Sabelli C , Tschermaks Mineralogische und Petrographische Mitteilungen , 21 (1974) p.164-178, Alunogen. Its structure and twinning, Locality: grotta dell allume, Vulcano Island, Italy