sedimentary
Limestone Pebble
Limestone (CaCO3)
AI-generated identification · may be incorrectHardness: 3 (Mohs scale), Color: light grey to beige, Luster: dull to earthy, Texture: fine-grained, smooth from water erosion. Reacts with dilute hydrochloric acid.
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Physical properties
Hardness: 3 (Mohs scale), Color: light grey to beige, Luster: dull to earthy, Texture: fine-grained, smooth from water erosion. Reacts with dilute hydrochloric acid.
Formation & geological history
Formed in shallow marine environments from the accumulation of calcium carbonate, including shell fragments and coral. This specific shape is the result of mechanical weathering and transport in water.
Uses & applications
Limestone is majorly used in the production of cement, as a flux in steel making, and as a soil conditioner in agriculture. Small river pebbles are used in landscaping and aquariums.
Geological facts
Limestone makes up about 10% of the total volume of all sedimentary rocks. It is the primary rock type in which most caves and karst topography develop due to its solubility in rainwater.
Field identification & locations
Identify by its relatively soft surface (can be scratched by a copper coin/steel) and its bubbling reaction to acid. Commonly found in riverbeds, lakeshores, and ancient sea beds.
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