AM_Clintonite Formula: Ca Mg2 Al4 Si O12 H2 Name: Clintonite Unit cell: 5.19 9.0 9.74 90.0 100.1 90.0 , V=447.91 Space group: C12/M1 (12)

Takeuchi Y , Sadanaga R , Acta Crystallographica , 12 (1959) p.945-946, The crystal structure of xanthophyllite, Locality: Chichibu mine, Japan