sedimentary
Rounded limestone pebble
Calcite-rich limestone, chiefly calcium carbonate (CaCO₃)
AI-generated identification · may be incorrectPale tan, fine-grained, dull to earthy surface with dark staining; likely Mohs hardness 3, though the image alone cannot confirm composition or hardness.
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Physical properties
Pale tan, fine-grained, dull to earthy surface with dark staining; likely Mohs hardness 3, though the image alone cannot confirm composition or hardness.
Formation & geological history
Limestone forms from accumulated carbonate sediments or shells that lithify; this rounded pebble was later worn smooth by water or abrasion. Its geological age cannot be determined from the photo.
Uses & applications
Common limestone is used in cement, aggregate, and building stone; this small pebble has mainly decorative or collecting value.
Geological facts
Limestone commonly reacts with dilute acid, producing bubbles of carbon dioxide; some pale pebbles that look similar may instead be other rocks.
Field identification & locations
The rounded shape and cream-colored, apparently fine texture fit a worn limestone pebble, but a close view or acid test would help identify it. Limestone occurs widely in sedimentary terrains worldwide.
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