sedimentary
Limestone
Calcium carbonate, CaCO3
AI-generated identification · may be incorrectHardness of 3 on Mohs scale, colors range from white to gray and tan, dull to earthy luster, and reacts with dilute hydrochloric acid.
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Physical properties
Hardness of 3 on Mohs scale, colors range from white to gray and tan, dull to earthy luster, and reacts with dilute hydrochloric acid.
Formation & geological history
Formed through the accumulation of skeletal fragments like coral, algal, and molluscan debris, typically in shallow marine environments over millions of years.
Uses & applications
Widely used in construction as aggregate, for manufacturing cement, in agriculture to neutralize soil acidity, and as a dimension stone.
Geological facts
Limestone frequently contains well-preserved fossils and forms massive underground cave systems due to its solubility in slightly acidic water.
Field identification & locations
Identify in the field by its characteristic effervescence when exposed to acid and its soft, fine-grained texture; found globally in ancient marine basins.
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