sedimentary

Fossiliferous Limestone

Biogenic Calcium Carbonate (CaCO3)

AI-generated identification · may be incorrect

Hardness: 3 on Mohs scale; Color: Gray, tan, or white; Luster: Dull to earthy; Structure: Clastic or crystalline with visible fossil fragments; Cleavage: None (rhombohedral in calcite crystals within); Specific Gravity: 2.3-2.7

Hardness: 3 on Mohs scale
Color: Gray, tan, or white
Luster: Dull to earthy

Identified May 30, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed in marine environments from the accumulation of shell, coral, algal, and fecal debris. Over millions of years, these sediments are lithified through compaction and cementation. Often dates from the Paleozoic to Cenozoic eras.

Uses & applications

Used widely in construction as building stone, road base, and as a primary ingredient in cement. It is also used in agriculture to neutralize soil acidity and as a flux in steel making.

Geological facts

Limestone covers about 10% of the Earth's land surface. It is the primary rock type found in karst landscapes, resulting in spectacular caves and sinkholes.

Field identification & locations

Identify in the field by applying a drop of dilute hydrochloric acid; it will effervesce (fizz). Look for visible imprints or fragments of ancient marine life. Commonly found in areas that were once prehistoric seabeds.