[illumanaughty]

If you click into one of the examples they have a photo of a hand holding a sample plus photos of the beach.

[Animats]

Well, here's a video which ends with a hand holding a sample.[1] It's a sand-making plant. Big rocks go in, and repeated crushing makes them into sand-sized rocks.

[1] https://www.youtube.com/watch?v=lVBiRPkQ0MI