AM_Macfallite_1 Formula: Ca2 Mn2.511 Al.27 Mg.09 Cu.03 V.009 Si3 O14 H3 Name: Macfallite Unit cell: 8.959 6.072 10.218 90.0 110.75 90.0 , V=519.79 Space group: P121/M1 (11)

Nagashima M , Rahmoun N S , Alekseev E V , Geiger C A , Armbruster T , Akasaka M , American Mineralogist , 93 (2008) p.1851-1857, Crystal chemistry of macfallite: Relationships to sursassite and pumpellyite, Locality: Manganese Lake, Copper Harbor, Keweenaw County, Michigan