This BSE photo shows (part of) a large cluster of monazite grains included within a single garnet in a whiteschist. This sample has only one generation of monazite (metapelitic samples from the same region show two generations of monazite, the younger of which is the same age as the ones in this sample). The other garnets in this sample have few (or none at all) monazite inclusions. The monazites included within the other garnets of this sample show different levels of Y based upon where in the garnet they are located. The ones in the garnet cores (there is a circle of quartz inclusions at the core-rim boundary for these garnets) are low in Y (0.07 to 0.4 wt%), while the ones in the rims and in the matrix are higher in Y (0.99 to 2.7 wt%). However, this cluster, which is located within the core of its garnet, as defined by the circle of quartz inclusions (see below ppl photo of the garnet which hosts the cluster of mnz), has the same high levels of Y as seen in the monazite included within the rims of the other garnets.
I've had some thoughts about this cluster and its implications for this sample, but I would welcome hearing what others have to say about it.