AM_Groutite_1 Formula: Mn O2 H Name: Groutite Unit cell: 10.667 2.871 4.554 90.0 90.0 90.0 , V=139.47 Space group: PNMA (62)

Kohler T , Armbruster T , Libowitzky E , Journal of Solid State Chemistry , 133 (1997) p.486-500, Hydrogen bonding and Jahn-Teller distortion in groutite, alpha-MnOOH,, and manganite, gamma-MnOOH, and their relations to the manganese, dioxides ramsdellite and pyrolusite, Locality: Nchwaning Mine, Kalahari manganese field, Republic of South Africa