AM_Groutellite Formula: Mn O2 Name: Groutellite Unit cell: 9.5155 2.8644 4.7061 90.0 90.0 90.0 , V=128.27 Space group: PNMA (62)

Post J E , Heaney P J , American Mineralogist , 89 (2004) p.969-975, Neutron and synchrotron X-ray diffraction study of the structures, and dehydration behaviors of ramsdellite and groutellite