Fig. 1

The occurrence of zirconolite grain from NWA 4485. a BSE image of the zirconolite grain, occurring as a mineral fragment in matrix of the lunar regolith breccia. This grain is surrounded by plagioclase (Pl), pyroxene (Px), and silicate melts (Melt). b Contrast-enhanced backscattered image of the grain, showing a homogeneous composition. c The grain is dark in CL image, showing no trace elements heterogeneity or dislocation