AM_Groatite Formula: Na Ca Mn2 P3 O12 H2 Name: Groatite Unit cell: 12.5435 12.4324 6.7121 90.0 115.332 90.0 , V=946.07 Space group: C12/C1 (15)

Cooper M A , Hawthorne F C , Ball N A , Ramik R A , Roberts A C , The Canadian Mineralogist , 47 (2009) p.1225-1235, Groatite, NaCaMn2(PO4)[PO3(OH)]2, a new mineral species of the alluaudite group, from the Tanco Pegmatite, Bernic Lake, Manitoba, Canada: Description and, crystal structure, Locality: Tanco Pegmatite, Bernic Lake, Manitoba, Canada