sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock / CaCO3 with fossil fragments

AI-generated identification · may be incorrect

Hardness of 3 on the Mohs scale, typically gray, tan, or buff in color, dull to earthy luster, compact crystal structure consisting of microcrystalline calcite, specific gravity around 2.7.

Identified August 5, 2026More sedimentary →

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Physical properties

Hardness of 3 on the Mohs scale, typically gray, tan, or buff in color, dull to earthy luster, compact crystal structure consisting of microcrystalline calcite, specific gravity around 2.7.

Formation & geological history

Formed through the accumulation and lithification of organic debris such as shells, coral, algal, and other skeletal fragments in marine environments over millions of years.

Uses & applications

Used in construction, as a building stone, in the manufacture of lime and cement, and prized by fossil collectors and educators.

Geological facts

Many famous historical buildings and monuments, such as the Great Pyramid of Giza and parts of the Empire State Building, incorporate limestone containing visible fossils.

Field identification & locations

Can be identified in the field by its reaction to dilute hydrochloric acid (effervescence) and the presence of visible fossil impressions or shell fragments embedded in the matrix.