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Mineral contains: groutite
Dent Glasser L S, Ingram L (1968) Refinement of the crystal structure of groutite, α-MnOOH. Acta Crystallographica B24, 1233-1236
Fleischer M (1948) New mineral names. American Mineralogist 33, 384-386
Gruner J W (1947) Groutite, HMnO2, a new mineral of the diaspore-goethite group. American Mineralogist 32, 654-659
Kohler T, Armbruster T, Libowitzky E (1997) Hydrogen bonding and Jahn-Teller distortion in groutite, α-MnOOH, and manganite, γ-MnOOH, and their relations to the manganese dioxides ramsdellite and pyrolusite. Journal of Solid State Chemistry 133, 486-500
Majmundar H H (1969) Ramsdellite and groutite from Nova Scotia. The Canadian Mineralogist 9, 718-720
Post J E, McKeown D A, Heaney, P J (2020) Raman spectroscopy study of manganese oxides: Tunnel structures. American Mineralogist 105, 1175-1190
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