What is the difference between chalk and edible chalk?

Chalk refers to retail chalk that has added chemicals to make it more suitable for art use or gym chalk however edible chalk refers to natural chalk that has not been processed and comes directly from chalk mountains.
Chalk refers to retail chalk that has added chemicals to make it more suitable for art use or gym chalk however edible chalk refers to

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UCLAYS BELGOROD edible Chalk - buy Belgorod edible chalk chunks

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Greenlistsoap Chalk Edible, Chalk Belgorod 8Oz, (250 gr) Natural

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ASMR Edible Chalk Eating Sounds, 먹는분필 먹방, 챌린지

8 Best Edible Chalks Review - The Jerusalem Post

Is edible chalk safe to eat and does it really provide nutrients