sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, typically white, gray, or buff in color, with a dull to earthy luster and fine-grained to crystalline structure.
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Physical properties
Hardness of 3 on the Mohs scale, typically white, gray, or buff in color, with a dull to earthy luster and fine-grained to crystalline structure.
Formation & geological history
Formed through the accumulation of skeletal fragments from marine organisms or chemical precipitation in shallow marine environments over millions of years.
Uses & applications
Widely used in construction as building stone, aggregate for roads, and as a primary raw material for manufacturing cement and agricultural lime.
Geological facts
Limestone frequently contains well-preserved fossils of ancient marine life and can dissolve over time to form extensive underground cave systems.
Field identification & locations
Easily identified in the field by its effervescence when exposed to dilute hydrochloric acid; found globally in regions with ancient marine depositional histories.
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