Summary: Iraqite, a new mineral of the ekanite group from northern Iraq, has the composition (Ln_1·33 Th_0·66 x_0·15) (K_1·07 y_0·93) (Ca_3·49 Ln_0·35 Na_0·16) (Si_15·69 Al_0·27) (O_39·93 F_0·07) where x = U, Pb, Zr, Fe, Mg, and Cu, and y is presumed to be vacant sites. It occurs in granite in contact with dolomitic marble. The colour is pale greenish yellow; H 4½ D_calc 3·28 and D_meas 3·27 (Berman balance), both corrected for minor impurity and non-structural water. Optically it is uniaxially negative with ω 1·590 and ε 1·585 though some sections show anomalous extinction up to 7°. Space group is P4/mcc with a 7·61±0·01 and c 14·72±0·02 Å. Strongest lines of the indexed powder pattern are 5·28(100), 3·31(100), 2·64(100), 7·36(80), 3·38(80), 3·40(60), 2·7(40), 7·62(30). Thermal data are given.