AM_Thomasclarkite-(Y) Formula: Na Y C O12 H15 Name: Thomasclarkite-(Y) Unit cell: 4.556 13.018 4.556 90.0 90.15 90.0 , V=270.22 Space group: P121 (3)

Grice J D , Gault R A , The Canadian Mineralogist , 36 (1998) p.1293-1300, Thomasclarkite-(Y), a new sodium - rare-earth-element bicarbonate mineral, species from Mont Saint-Hilaire, Quebec, Note: z-coodinate for OH2 changed., Locality: Mont Saint-Hilaire, Quebec, Canada