AM_Pumpellyite-(Mn2+)_1 Formula: Si3 Mg.29 Al2.236 Mn.474 Ca2 O14 H4 Name: Pumpellyite-(Mn2+) Unit cell: 8.833 5.9153 19.1009 90.0 97.154 90.0 , V=990.25 Space group: A12/M1 (12)

Artioli G , Pavese A , Bellotto M , Collins S P , Lucchetti G , American Mineralogist , 81 (1996) p.603-610, Mn crystal chemistry in pumpellyite: A resonant scattering powder diffraction, Rietveld study using synchrotron radiation, Sample: SN5