sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness 3 on the Mohs scale, colors range from white to gray and tan, dull to earthy luster, and it reacts vigorously with dilute hydrochloric acid.
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Physical properties
Hardness 3 on the Mohs scale, colors range from white to gray and tan, dull to earthy luster, and it reacts vigorously with dilute hydrochloric acid.
Formation & geological history
Formed through the accumulation of shell, coral, algal, and fecal debris or direct chemical precipitation of calcium carbonate in marine environments.
Uses & applications
Widely used in construction as building stone, aggregate in concrete, production of lime and cement, and in agricultural soil conditioning.
Geological facts
Limestone frequently contains well-preserved fossils of ancient marine organisms and can form massive cave systems through acidic groundwater dissolution.
Field identification & locations
Identify in the field by its pale color, fine-grained texture, and characteristic fizz when tested with an acid solution. Found globally in shallow marine basins.
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