AM_Tiragalloite Formula: Mn4 As Si3 O13 H Name: Tiragalloite Unit cell: 6.66 19.92 7.67 90.0 95.7 90.0 , V=1012.53 Space group: P121/N1 (14)

Gramaccioli C M , Pilati T , Liborio G , Acta Crystallographica, Section B , 35 (1979) p.2287-2291, Structure of a manganese(II) arsenatotrisilicate, Mn4[AsSi3O12(OH)]:, The presence of a new tetrapolyphosphate-like anion, Locality: Molinello, near Chiavari, Liguria,, Note: Displacement parameters taken from ICSD