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I've seen grit and oyster shell equated on here before and I hate to see this, for the chicks' sake. As Ridgerunner said, chicks should not get oyster shell. It may be that it will function the way grit does and help grind food, I don't know, but they will absorb unneeded calcium from it. If that were not the case, it wouldn't work as a calcium supplement for layers.
I won't mix either oyster shell or grit with feed, because that is me telling them how much they should eat. Hopefully their instinct is wiser than my guess would be.