AM_Defernite_1 Formula: Ca6 C1.58 O14.679 Si.84 Cl.498 H7 Name: Defernite Unit cell: 17.744 22.601 3.633 90.0 90.0 90.0 , V=1456.95 Space group: PNAM (62)

Armbruster T , Yang P , Liebich B W , American Mineralogist , 81 (1996) p.625-631, Mechanism of the SiO4 for CO3 substitution in defernite,, Ca6(CO3)1.58(Si2O7)0.21(OH)7[Cl0.50(OH)0.08(H2O)0.42]: A single-crystal X-ray, study at 100 K