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Longest lasting grit is Granite, and lasts well. All other rock and stone is so much softer, that it wears down fast and that is why granite grit is best choice of grit. It works really well for best utilization of feeds. My chickens are given free choice and they choose it with pleasure,
Oyster shells can act as grit to an extent, but young birds who are not laying should not have oyster shell. Grit that is usually granite grit does the job much better than oyster shell, which really isn't that hard. Grit grinds the Oyster Shell. While the gizzard is an amazingly strong organ, the Grit is a part of its function. Also, if they free range they will eat dirt for grit, but I always have a dish of granite grit and a dish of oyster shells near their feed.
I also put golf balls in the nest boxes.