sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on Mohs scale, typically white to light gray or tan, dull to earthy luster, microcrystalline to granular structure.
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Physical properties
Hardness of 3 on Mohs scale, typically white to light gray or tan, dull to earthy luster, microcrystalline to granular structure.
Formation & geological history
Formed through the accumulation of skeletal fragments of marine organisms or chemical precipitation of calcium carbonate in shallow marine environments over millions of years.
Uses & applications
Widely used in construction, cement production, agriculture to neutralize acidic soils, and as a dimension stone.
Geological facts
Limestone often contains well-preserved fossils of ancient marine life and dissolves slowly in acidic water, creating cave systems and karst topography.
Field identification & locations
Easily identified by its reaction to dilute hydrochloric acid, which causes it to fizz due to carbon dioxide release. Commonly found worldwide in sedimentary basins.
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Sedimentary limestone with invertebrate fossil imprint
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