AM_Mckelveyite-(Y) Formula: Na1.07 Ba2.79 Sr.31 Ca.95 Y.74 Ce.13 C6 O21 H6 Name: Mckelveyite-(Y) Unit cell: 15.8213 9.1364 13.7522 90.0 112.44 90.0 , V=1837.35 Space group: C1C1 (9)

Demartin F , Gramaccioli C M , Campostrini I , Diella V , The Canadian Mineralogist , 46 (2008) p.195-203, The crystal structure of mckelveyite-(Y)-2M, a new monoclinic polytype from, Val Malenco, Italian Alps, Locality: Cava Fabi, talc quarry near Lanzada, Val Malenco, Lombardy, Italy