
This is in fact a section through a pharmaceutical pellet of the sort you sometimes find in capsules. It is an old scanned image from a polaroid photomicrograph taken through a Projectina microscope and not of the best quality, but I think it illustrates what I have in mind. It struck me that there may be a structural similarity and indeed possibly similarities in the method of formation.
This type of pellet starts with a seed crystal, or non-pareil. Several kilos would be placed in a rotating pan, not unlike a cement mixer. Then, small quantities of sugar syrup, or other suspensions containing a binding agent are applied to the pellets, with hot air being used for drying. Slowly, layers are built up around the central seed and eventually the coating pan will contain many, many small spheroidal pellets. You can see the onion-layer type of structure in the pellet cross section. Alernatively, the seeds may be suspended in a stream of air (a "fluid bed") and coatings applied by means of spraying.
It seems to me that the meteoric inclusion has a rather similar structure and may well have been formed around a seed crystal and then the "pellet" itself ended up as an inclusion in a larger body.