AM_Epididymite_2 Formula: Na2 Be2 Si6 O17 H2 Name: Epididymite Unit cell: 12.66 7.34 13.48 90.0 90.0 90.0 , V=1252.62 Space group: PNAM (62)

Pobedimskaya E A , Belov N V , Doklady Akademii Nauk SSSR , 129 (1959) p.900-903, The crystal structure of epididymite: a new type of infinite, silicooxygenous chains