What is the formation mechanism of small particles in thin section?

[okstone]

Poikilitic texture or bubbles？

 

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[okstone]

Volcanic or sedimentary rocks should be excluded. What puzzles me is whether metamorphic rocks on earth have this structure? How was it formed? Only from the thin section, it looks a bit like NWA 6704.

 

[okstone]

I picked up a lot of such stones at the same place. I'm not sure if they are meteorites. The particles in the thin section may be some fluid inclusions.