Formula: Ca2 Al O9.5 H12 C.36 Cl.48
Name: Hydrocalumite
Unit cell: 10.02 5.751 16.286 90.0 104.22 90.0 , V=909.73
Space group: C12/C1 (15)

Sacerdoti M , Passaglia E , Neues Jahrbuch fur Mineralogie, Monatshefte , 1988 (1988) p.462-475, Hydrocalumite from Latium, Italy: its crystal structure and relationship, with related synthetic phases, Note: this is the structure of the subcell, not the true cell, Locality: Montalto di Castro, Viterbo, Latium, Italy