What are these tiny white blobs?

I've completed three flushes (one at night and two during the day).

The first two helped me eliminate lots of green "sludge" and dozens of pea-sized green stones.

The third flush was different. I initially passed more green stones and sludge. Then, I passed hundreds of tiny white blobs that resembled sesame seeds. They floated and were soft (easy to crush).

What are these tiny white blobs?

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