sedimentary
Limestone Pebble
Sedimentary carbonate rock (primarily CaCO3)
AI-generated identification · may be incorrectHardness 3 on Mohs scale, grayish-brown color, dull to earthy luster, fine-grained texture, and effervesces with dilute hydrochloric acid.
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Physical properties
Hardness 3 on Mohs scale, grayish-brown color, dull to earthy luster, fine-grained texture, and effervesces with dilute hydrochloric acid.
Formation & geological history
Formed from the accumulation of skeletal fragments of marine organisms or chemical precipitation in shallow marine environments over millions of years.
Uses & applications
Used primarily in construction, aggregate, cement production, and agricultural soil conditioning.
Geological facts
Limestone often preserves abundant marine fossils and covers extensive areas of the Earth's continental crust.
Field identification & locations
Easily identified by its reaction to acid and softness, commonly found in riverbeds, beaches, and sedimentary rock outcrops.
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