sedimentary
Limestone Pebble
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectMohs hardness of 3, light gray to white color, dull to earthy luster, fine-grained microcrystalline structure, poor cleavage, specific gravity around 2.7.
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Physical properties
Mohs hardness of 3, light gray to white color, dull to earthy luster, fine-grained microcrystalline structure, poor cleavage, specific gravity around 2.7.
Formation & geological history
Formed from the accumulation of skeletal fragments of marine organisms and shell debris in shallow marine environments, typically over millions of years, then subsequently weathered and water-worn into a smooth pebble.
Uses & applications
Used in construction, aggregate for concrete, road base, and agricultural lime.
Geological facts
Limestone often weathers to form distinctive karst topography featuring caves and sinkholes due to its solubility in slightly acidic water.
Field identification & locations
Commonly found in stream beds and beaches near sedimentary rock formations; easily identified by its characteristic reaction (effervescence) when exposed to weak acid like vinegar.
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