What does the sand on a beach contains?

Yesterday I was at Girgaon chaupati beach. I lifted a pinch of sand to check what it contains. It had many tiny objects which gave indications of the rich marine life. I could not identify the organisms just by looking at the broken parts but nonetheless it was fsdcfascina to see so many beautiful objects in that sand. Sharing some photos. I suspect that some of the objects are not broken parts of doms bigger organisms but they themselves are some tiny organisms. All photos are taken at 20 to 25x magnification using lens attached to light module and digital zoom of the phone.

 

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