sedimentary
Limestone pebble
Sedimentary carbonate rock (CaCO3)
AI-generated identification · may be incorrectHardness 3 on Mohs scale; color ranges from white, gray to tan; dull to earthy luster; fine-grained crystal structure with no visible cleavage.
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Physical properties
Hardness 3 on Mohs scale; color ranges from white, gray to tan; dull to earthy luster; fine-grained crystal structure with no visible cleavage.
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 the construction industry for producing cement, road aggregate, and as a soil conditioner in agriculture.
Geological facts
Limestone often contains well-preserved fossils of ancient marine life and reacts vigorously with dilute hydrochloric acid.
Field identification & locations
Easily identified by its reaction to acid and relative softness; found worldwide in sedimentary basins and ancient sea beds.
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