sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, colors range from white to gray and yellowish brown, dull to earthy luster, and it effervesces when exposed to weak acid.
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Physical properties
Hardness of 3 on the Mohs scale, colors range from white to gray and yellowish brown, dull to earthy luster, and it effervesces when exposed to weak acid.
Formation & geological history
Formed through the accumulation of skeletal fragments from marine organisms or chemical precipitation of calcium carbonate in shallow marine environments over millions of years.
Uses & applications
Widely used in the construction industry for crushed stone, cement production, and as a dimensional building stone, as well as in agriculture to neutralize acidic soils.
Geological facts
Limestone frequently contains well-preserved fossils and forms massive underground cave systems through the chemical weathering of dissolution by acidic groundwater.
Field identification & locations
Easily identified by its characteristic fizzing reaction with dilute hydrochloric acid and soft, fine-grained sedimentary texture found in regions with ancient shallow seas.
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