sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, typically gray to white in color, dull to sub-earthy luster, and effervesces strongly when exposed to weak acid.
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Physical properties
Hardness of 3 on the Mohs scale, typically gray to white in color, dull to sub-earthy luster, and effervesces strongly when exposed to weak acid.
Formation & geological history
Formed through the accumulation of skeletal fragments from marine organisms or chemical precipitation, primarily in shallow marine environments over millions of years.
Uses & applications
Extensively used in construction as building blocks, crushed stone for road bases, production of cement, and agricultural soil conditioning.
Geological facts
Limestone frequently contains well-preserved fossils and forms dramatic cave systems through dissolution by acidic groundwater.
Field identification & locations
Easily identified by its reaction with acid and relatively soft texture, found abundantly worldwide in sedimentary basins.
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