sedimentary
Rounded limestone pebble
Limestone, predominantly calcite (CaCO₃)
AI-generated identification · may be incorrectPale cream-gray, dull to slightly sugary surface, with dark pits or inclusions; likely Mohs hardness 3 and specific gravity about 2.7. The image does not show enough detail to determine its texture or exact mineral composition.
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Physical properties
Pale cream-gray, dull to slightly sugary surface, with dark pits or inclusions; likely Mohs hardness 3 and specific gravity about 2.7. The image does not show enough detail to determine its texture or exact mineral composition.
Formation & geological history
Likely formed from carbonate sediment or shell material that lithified, then was rounded by water or abrasion; limestone can range from recent to hundreds of millions of years old.
Uses & applications
Commonly used for aggregate, cement, and building stone; this small pebble has little commercial value and may be kept as a natural-history specimen.
Geological facts
Calcite fizzes in dilute acid, a useful test for many limestones; dark marks may be inclusions or surface staining.
Field identification & locations
A rounded shape suggests transport in water or prolonged abrasion. Limestone is widespread, but the exact source cannot be identified from the photo; test a concealed spot with vinegar for weak fizzing.
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