sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on Mohs scale, colors range from white to gray and black, dull to earthy luster, fine-grained crystal structure, exhibits conchoidal fracture.
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Physical properties
Hardness of 3 on Mohs scale, colors range from white to gray and black, dull to earthy luster, fine-grained crystal structure, exhibits conchoidal fracture.
Formation & geological history
Formed through the accumulation of shell, coral, algal, and fecal debris, or via chemical precipitation of calcium carbonate in marine environments over millions of years.
Uses & applications
Widely used in construction as building stone, as an aggregate for roads, in the manufacture of cement, and for agricultural soil neutralization.
Geological facts
Limestone often preserves abundant marine fossils and is prone to dissolution by acidic water, creating spectacular cave systems and karst topography.
Field identification & locations
Easily identified in the field by its effervescence when interacting with dilute hydrochloric acid. It is globally abundant in sedimentary basins.
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