Why can't we digest rocks?
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Rocks are not very digestible. That's why they are still around as rocks! Digestion works by chemical reactions in the stomach and intestines. read more
There are many minerals/rocks which would be ‘digestible’ but would be toxic if ingested, e.g. Witherite - Wikipedia (BaCO3; found in carbonate rocks) and Pharmacolite - Wikipedia (Any arsenate mineral would be digestible but toxic which is one of the reasons why they were used in rat poisons). read more
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