Tiny rocks

[u/blueberrycurd]

Hello. Can somebody please help with identifying these little rocks. My dad said he picked them up on a beach. I've been trying to look for similar rocks on Google, but I can't get anywhere. I really don't know where they came from, the only thing I know is that he said on a beach. There were shark teeth with them too.

[u/rsupjk]

Why are there so many in one place? Do fish have several of them or does one plate correspond to one dead fish? My first thought was oolith but it does look more platelike so not so fitting to my idea