Image credit: James St. John
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If this rock does NOT contain fragments of rock (e.g., pebbles) with CaCO3 , then it will NOT react to dilute, cold, HCl (acid)
Image credit: Scott Brande, CC4.0 License
If this rock DOES contain pebbles of CaCO3 then the pebbles WILL react strongly to dilute, cold, HCl (acid)