Looks like crushed and ground up shell that people can use to directly mix into feed mixes. There is also a variety of just crushed shell that is a flake style.
Yep, that's it. We just got some for our 4-month old hens as well. You have to remember they have to eat it that's why it's crushed so finely. They don't have molars!
If it said "oyster shell" then legally the shells could ONLY be from oysters, when reality is all mollusk shells are calcium carbonate, and that's the only thing that matters
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The concentration is probably so low it won't do anything. My best bet is that it is there to prevent the calcium carbonate (esentially ground up shells) from becoming one big brick of shells. It's an anti-caking agent.
I'm not so sure it's "added"
The bag says "contains", and if you think about it, "Silica Quartz" would just be SAND
It's probably just what they couldn't wash out of the shells