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Eating the entire thing is not generally a requirement for something being edible. You can't eat an entire cow, yet cow meat is considered edible (and if you want to say "but you can freeze a cow and eat it bit by bit", consider an adult blue whale - I don't think one human eats that much meat in a lifetime).

You can absolutely eat rocks, most of them aren't even that bad for you if they're somewhat smooth and not too large. Or just grind it down into a powder and bake it into bread, mix it into a milkshake or make a pill out of it. "healing earth" is a thing (helps with digestion) and it's just clay, you're supposed to either take it as a pill or mix it into water.