sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, grayish-brown color, dull to earthy luster, microcrystalline crystal structure, and effervesces strongly in dilute hydrochloric acid.
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Physical properties
Hardness of 3 on the Mohs scale, grayish-brown color, dull to earthy luster, microcrystalline crystal structure, and effervesces strongly in dilute hydrochloric acid.
Formation & geological history
Formed through the accumulation and compaction of marine organism skeletal fragments, shells, and coral in shallow marine environments over millions of years.
Uses & applications
Widely used in construction as crushed stone, dimension stone, and as a primary raw material in the manufacturing of Portland cement and agricultural lime.
Geological facts
Many fossiliferous limestones contain well-preserved crinoids, brachiopods, or bryozoans, providing a direct snapshot of ancient shallow sea ecosystems.
Field identification & locations
Easily identified by visible fossil fragments embedded within the matrix and a positive reaction to acid; commonly found in sedimentary basins worldwide.
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