https://rock.id/p/limestone/TDx1ubnppwNCgiF45eFi
Limestone (Calcium Carbonate (CaCO3)) — sedimentary | Rock Identifier
Limestone (Calcium Carbonate (CaCO3)) — a sedimentary specimen. Hardness: 3 on Mohs scale; Color: typically gray, tan, or white; Luster: dull to earthy;...
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https://rockidentify.net/tools/limestone-identifier
Free Online Limestone Identifier | Photo Identification
Use our free online limestone identifier to compare limestone by photo. Upload layers and shell fragments, then explore marble or dolostone lookalikes.
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