Can someone help identify if this is contamination or not?

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Maureen Lynch

I doubt that it is contamination. Looks like something has crystalized.

Alireza Mordadi

I strongly recommend Maureen Lynch answer.

Their do not look like any cells that I ever seen.

Nicolas Barois

I agree with Maureen, squared objects are crystals!

Marwan E Majzoub

definitely cystals

Júlia Sala Jarque

I've seen many of those in my cell cultures when I add the medium to the cell culture too late, or even when the concentration of my growth factors was not balanced. You should reconsider what you are adding to your medium. Hope it helps :)